Filtering humdrum data
Nathaniel Condit-Schultz
July 2022
Source:vignettes/Filtering.Rmd
Filtering.RmdWelcome to “Filtering humdrum data”! This article explains how humdrum\(_{\mathbb{R}}\) can be used find subsets of humdrum data. Most humdrum datasets contain a wealth of information: rhythms, pitches, lyrics, etc. However, the particular analysis you want to conduct today might not need all that information. The first step after loading humdrum data is usually to “filter out” the information you don’t need. (Of course, you are not erasing it from the original files, which are safe on your computer!) This is often just one part of larger task of preparing your data. You don’t necessarily need to do this, but usually it makes things simpler when you simply get anything you don’t need out of the way.
In this article, we’ll use our pre-packaged Bach chorale data to illustrate how filtering works, so let’s load it up:
chorales <- readHumdrum(humdrumRroot, 'HumdrumData/BachChorales/.*krn')Indexing
The simplest, common, way to filter your data is through “indexing,”
a common means in programming for selecting subsets of data. In R, we
use the square brackets, [], to index various data objects,
including basic atomic vectors, data.tables, and lists. For example,
using brackets I can extract subsets of a vector:
Watch out! R actually has two different ways of
indexing: you can use a single pair of matches brackets
([ ]) or a double pair ([[ ]]). If you want a
primer on how these two types of indexing are used in normal R objects,
check out the R
primer—you really don’t need to do this before getting into
humdrum\(_{\mathbb{R}}\), but you might
want to eventually.
We can use the single-bracket [] or double-bracket
[[]] commands to index our humdrum\(_{\mathbb{R}}\) data objects.
- The single-brackets are used to index whole pieces in your data.
- The double-brackets are used to index within pieces in your data.
Either type of bracket can accept either numeric or
character vectors to index by.
To do indexing in a pipe, using the index()
([]) and index2() commands
([[]]).
Single-bracket indexing
The single-brackets are used to index whole pieces in your
data. So if you have a dataset of 19 files, but you only want to look at
some of those files, you’d use the single-brackets [].
Numeric indices (for single-brackets)
If we give a numeric value i to a
single-bracket index command, that number will select the
ith file in the dataset. For example, if we want to look
only at the fifth chorale, we can call:
chorales[5]
> ######################## vvv chor005.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: An Wasserflüssen Babylon
> 4: !!!SCT: BWV 267
> 5: !!!PC#: 5
> 6: !!!AGN: chorale
> 7: **kern **kern **kern **kern
> 8: *ICvox *ICvox *ICvox *ICvox
> 9: *Ibass *Itenor *Ialto *Isoprn
> 10: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 11: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 12: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 13: *>A *>A *>A *>A
> 14: *clefF4 *clefGv2 *clefG2 *clefG2
> 15: *k[f#] *k[f#] *k[f#] *k[f#]
> 16: *G: *G: *G: *G:
> 17: *M4/4 *M4/4 *M4/4 *M4/4
> 18: *met(c) *met(c) *met(c) *met(c)
> 19: *MM100 *MM100 *MM100 *MM100
> 20: 4G 4B 4g 4dd
> 21: =1 =1 =1 =1
> 22: 4C 8cL 4g 4ee
> 23: . 8BJ . .
> 24: 4D 4A 4f# 8ddL
> 25: . . . 8ccJ
> 26: 4E 4e 4g 8bL
> 27: . . . 8ccJ
> 28: 8F#L 8AL 4f# 4dd
> 29: 8GJ 8BJ . .
> 30: =2 =2 =2 =2
> 31: 4A 8cL 8eL 8ccL
> 32: . 8eJ 8gJ 8bJ
> 33: 4D 4d 8gL 4cc
> 34: . . 8f#J .
> 35: 4G; 4d; 4g; 4b;
> 36: 4F# 4d 4a 4a
> 37: =3 =3 =3 =3
> 38: 8GL 4d 4g 4b
> 39: 8F#J . . .
> 40: 4E 8GL 4g 4cc
> 41: . 8AJ . .
> 42: 4BB 8BL 4g 4dd
> 43: . 8GJ . .
> 44: 4C 4e 4g 8ccL
> 45: . . . 8bJ
> 46: =4 =4 =4 =4
> 47: 2D 8AL 4g 8aL
> 48: . 8BJ . 8gJ
> 49: . 4c 4f# 4a
> 50: 4GG; 4B; 4d; 4g;
> 51: =:|! =:|! =:|! =:|!
> 52: *>B *>B *>B *>B
> 53: 4G 4B 4d 4g
> 54: =5 =5 =5 =5
> 55: 4F# 4A 8dL 4a
> 56: . . 8eJ .
> 57: 8EL 4d 4f# 4b
> 58: 8DJ . . .
> 59: 4E 4G 4e 8ccL
> 60: . . . 8bJ
> 61: 4F# 4A 8eL 4a
> 62: . . 8dJ .
> 63: =6 =6 =6 =6
> 64: 4G 8AL 4d 4b
> 65: . 8GJ . .
> 66: 4D 8GL 4c 4a
> 67: . 8F#J . .
> 68: 4GG; 4G; 4B; 4g;
> 69: 4C 4G 4e 8gL
> 70: . . . 8aJ
> 71: =7 =7 =7 =7
> 72: 8GL 4G 4d 4b
> 73: 8FJ . . .
> 74: 8EL 4G 4e 4cc
> 75: 8DJ . . .
> 76: 8CL 4G 4f 4dd
> 77: 8BBJ . . .
> 78: 8CL 4G 8eL 4ee
> 79: 8DJ . 8f#J .
> 80: =8 =8 =8 =8
> 81: 4E 8GL 8gL 4b
> 82: . 16AL 8f#J .
> 83: . 16BJJ . .
> 84: 4AA 4A 8gL 4cc#
> 85: . . 8aJ .
> 86: 4D; 4A; 4f#; 4dd;
> 87: 8GL 4G 4d 8bL
> 88: 8AJ . . 8ccJ
> 89: =9 =9 =9 =9
> 90: 4B 8GL 4g 4dd
> 91: . 8dJ . .
> 92: 4c 8cL 4g 4ee
> 93: . 8BJ . .
> 94: 4F# 4A 4a 8ddL
> 95: . . . 8ccJ
> 96: 4G# 4e 4b 4b
> 97: =10 =10 =10 =10
> 98: 4A 2e 8bL 2cc
> 99: . . 8g#J .
> 100: 4AA . 4a .
> 101: 4E; 4e; 4g#; 4b;
> 102: 4GG# 8eL 4b 4ee
> 103: . 8dJ . .
> 104: =11 =11 =11 =11
> 105: 8AAL 8cL 4a 4ee
> 106: 8BBJ 8BJ . .
> 107: 8CL [4A 8eL 4ee
> 108: 8AAJ . 8cJ .
> 109: 4F 8AL] 8dL 4a
> 110: . 8G#J 8eJ .
> 111: 8EL 8AL 4f 4dd
> 112: 8DJ 8BJ . .
> 113: =12 =12 =12 =12
> 114: 4E 8G# 4e 4cc
> 115: . 4A . .
> 116: 4EE . 4d 4b
> 117: . 8G# . .
> 118: 4AA; 4A; 4c; 4a;
> 119: 4AA 8EL 4a 4cc
> 120: . 8F#XJ . .
> 121: =13 =13 =13 =13
> 122: 8BBL 4GnX 8dL 4b
> 123: 8C#J . 8eJ .
> 124: 2D 8dL 4f 4a
> 125: . 8cJ . .
> 126: . 4B- 8eL 4g
> 127: . . 8dJ .
> 128: 4C# 4A [4e 8aL
> 129: . . . 8gJ
> 130: =14 =14 =14 =14
> 131: 4D 4A 8eL] 4f
> 132: . . 8dJ .
> 133: 4AA 4G 8dL 4e
> 134: . . 8c#J .
> 135: 4D; 4F#X; 4d; 4d;
> 136: 4BB 4F# 8dL 4d
> 137: . . 8cJ .
> 138: =15 =15 =15 =15
> 139: 4E 4G 8BL 4g
> 140: . . 8AJ .
> 141: 4D 4d 8GL 4a
> 142: . . 8F#J .
> 143: 8GL 4d 4G 4.b
> 144: 8F#J . . .
> 145: 4E 4e 4g .
> 146: . . . 8cc
> 147: =16 =16 =16 =16
> 148: 8BBL 2d 4f# 4dd
> 149: 8AAJ . . .
> 150: 4GG . 4g 8ccL
> 151: . . . 8bJ
> 152: 8CL 8eL 4g 4a
> 153: 8BBJ 8dJ . .
> 154: 4AA 4c [4g 8bL
> 155: . . . 8ccJ
> 156: =17 =17 =17 =17
> 157: 8DL 8dL 4g] 2a
> 158: 8CJ 8eJ . .
> 159: 4D 8dL 4f# .
> 160: . 8cJ . .
> 161: 4GG; 4B; 4d; 4g;
> 162: == == == ==
> 163: *- *- *- *-
> 164: !!!hum2abc: -Q ''
> 165: !!!title: @{PC#}. @{OTL@@DE}
> 166: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian ***
> 167: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&***
> 168: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371***
> 169: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.***
> 170: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 171: !!!EED: Craig Stuart Sapp
> 172: !!!EEV: 2009/05/22
> ######################## ^^^ chor005.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> Data fields:
> *Token :: characterWe can also give the command a vector of i numbers:
chorales[c(1,3,5)]
> ######################## vvv chor001.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern **kern **kern **kern
> 9: *ICvox *ICvox *ICvox *ICvox
> 10: *Ibass *Itenor *Ialto *Isoprn
> 11: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A *>A
> 15: *clefF4 *clefGv2 *clefG2 *clefG2
> 16: *k[f#] *k[f#] *k[f#] *k[f#]
> 17: *G: *G: *G: *G:
> 18: *M3/4 *M3/4 *M3/4 *M3/4
> 19: *MM100 *MM100 *MM100 *MM100
> 20: 4GG 4B 4d 4g
> 21: =1 =1 =1 =1
> 22: 4G 4B 4d 2g
> 23: 4E 8cL 4e .
> 24: . 8BJ . .
> 25: 4F# 4A 4d 4dd
> 26: =2 =2 =2 =2
> 27: 4G 4G 2d 4.b
> 28: 4D 4F# . .
> 29: . . . 8a
> 30: 4E 4G 4B 4g
> 31-133::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor001.krn ^^^ #########################
>
> (one other piece...)
>
> ######################## vvv chor005.krn vvv #########################
> 1-142::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 143: 8GL 4d 4G 4.b
> 144: 8F#J . . .
> 145: 4E 4e 4g .
> 146: . . . 8cc
> 147: =16 =16 =16 =16
> 148: 8BBL 2d 4f# 4dd
> 149: 8AAJ . . .
> 150: 4GG . 4g 8ccL
> 151: . . . 8bJ
> 152: 8CL 8eL 4g 4a
> 153: 8BBJ 8dJ . .
> 154: 4AA 4c [4g 8bL
> 155: . . . 8ccJ
> 156: =17 =17 =17 =17
> 157: 8DL 8dL 4g] 2a
> 158: 8CJ 8eJ . .
> 159: 4D 8dL 4f# .
> 160: . 8cJ . .
> 161: 4GG; 4B; 4d; 4g;
> 162: == == == ==
> 163: *- *- *- *-
> 164: !!!hum2abc: -Q ''
> 165: !!!title: @{PC#}. @{OTL@@DE}
> 166: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian ***
> 167: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&***
> 168: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371***
> 169: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.***
> 170: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 171: !!!EED: Craig Stuart Sapp
> 172: !!!EEV: 2009/05/22
> ######################## ^^^ chor005.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of three pieces.
>
> Data fields:
> *Token :: characterYou might want to use the R sequence command, :, to
select a range of numbers:
chorales[6:10]
> ######################## vvv chor006.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Christus, der ist mein Leben
> 4: !!!SCT: BWV 281
> 5: !!!PC#: 6
> 6: !!!AGN: chorale
> 7: **kern **kern **kern **kern
> 8: *ICvox *ICvox *ICvox *ICvox
> 9: *Ibass *Itenor *Ialto *Isoprn
> 10: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 11: *clefF4 *clefGv2 *clefG2 *clefG2
> 12: *k[b-] *k[b-] *k[b-] *k[b-]
> 13: *F: *F: *F: *F:
> 14: *M4/4 *M4/4 *M4/4 *M4/4
> 15: *met(c) *met(c) *met(c) *met(c)
> 16: *MM100 *MM100 *MM100 *MM100
> 17: 4FF 4A 4c 4f
> 18: =1 =1 =1 =1
> 19: 4F 4c 4f 4a
> 20: 4E 4c 4g 4g
> 21: 4E- 4c 4f 4a
> 22: 4D 4d 4f 4b-
> 23: =2 =2 =2 =2
> 24: 8CL 4G 8eL 2cc
> 25: 8D . 8f .
> 26: 8E 4c 8g .
> 27: 8CJ . 8eJ .
> 28: 4F; 4c; 4f; 4a;
> 29: 4BB- 4B- 4f 4dd
> 30: =3 =3 =3 =3
> 31-77:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor006.krn ^^^ #########################
>
> (three more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-70:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: 4D 8F# 4d 4b
> 72: . 4G . .
> 73: 4D . 4c 4a
> 74: . 8F# . .
> 75: 2GG; 2G; 2B; 2g;
> 76: =11 =11 =11 =11
> 77: 2C 2G 2e 2g
> 78: 4AA 4A 4e 4cc
> 79: 4E 4G# 8eL 4b
> 80: . . 8dJ .
> 81: =12 =12 =12 =12
> 82: 4F 4A 4c 4a
> 83: 4C 4G 4c 4e
> 84: 4BB- 4G [2d 4g
> 85: 4AA 4A . 4f
> 86: =13 =13 =13 =13
> 87: 4GG# 4B 4d] 1e;
> 88: 4AA 4A 4c .
> 89: 2EE; 2G#X; 2B; .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of five pieces.
>
> Data fields:
> *Token :: characterCharacter indices (for single-brackets)
If you supply a humdrum\(_{\mathbb{R}}\) object single-bracket index
a character string, humdrum\(_{\mathbb{R}}\) will treat that string as a
regular expression and return all the files that contain a match to that
expression in any data token—even if there is only one.
For example, we might be only interested in files that use flat
notes. Since **kern represents flats with “-”,
we can simply write:
chorales['-']
> ######################## vvv chor003.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Ach Gott, vom Himmel sieh darein
> 4: !!!OTL@EN: Oh God, look down from Heaven
> 5: !!!OPR: Cantata BWV 153: Schau, lieber Gott, wie meine Feind
> 6: !!!SCT: BWV 153/1
> 7: !!!PC#: 3
> 8: !!!AGN: chorale
> 9: **kern **kern **kern **kern
> 10: *ICvox *ICvox *ICvox *ICvox
> 11: *Ibass *Itenor *Ialto *Isoprn
> 12: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 13: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 14: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 15: *>A *>A *>A *>A
> 16: *clefF4 *clefGv2 *clefG2 *clefG2
> 17: *k[f#] *k[f#] *k[f#] *k[f#]
> 18: *a: *a: *a: *a:
> 19: !dorian !dorian !dorian !dorian
> 20: *M4/4 *M4/4 *M4/4 *M4/4
> 21: *met(c) *met(c) *met(c) *met(c)
> 22: *MM100 *MM100 *MM100 *MM100
> 23: 4E 4e 4g# 4b
> 24: =1 =1 =1 =1
> 25: 4A 4e 4a 4cc
> 26: 4B 4d 4g# 4b
> 27: 4c 4e 4a 4a
> 28: 8BL 8dL 8g#L 4ee
> 29: 8AJ 8cJ 8aJ .
> 30: =2 =2 =2 =2
> 31-110::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor003.krn ^^^ #########################
>
> (three more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-70::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: 4D 8F# 4d 4b
> 72: . 4G . .
> 73: 4D . 4c 4a
> 74: . 8F# . .
> 75: 2GG; 2G; 2B; 2g;
> 76: =11 =11 =11 =11
> 77: 2C 2G 2e 2g
> 78: 4AA 4A 4e 4cc
> 79: 4E 4G# 8eL 4b
> 80: . . 8dJ .
> 81: =12 =12 =12 =12
> 82: 4F 4A 4c 4a
> 83: 4C 4G 4c 4e
> 84: 4BB- 4G [2d 4g
> 85: 4AA 4A . 4f
> 86: =13 =13 =13 =13
> 87: 4GG# 4B 4d] 1e;
> 88: 4AA 4A 4c .
> 89: 2EE; 2G#X; 2B; .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of five pieces.
>
> Data fields:
> *Token :: characterLook at that, five of our ten chorales contain at least one flat. The other chorales have zero flats. Notice that we still get the whole files returned to us!
Double-bracket indexing
The double-brackets are used to index within pieces in your data. Specifically, if you only want to work with certain spines or records within your pieces. The double-brackets apply the same filters separately to each file in the dataset.
In double-bracket indexing, you can provide two separate arguments, either individually or together:
-
iis the first argument which will index records within each file. -
jis the second argument, which will index spines within each file.
If you want to use the j (spine) argument by itself, you
should put a comma before it, to indicate that you are skipping over
i. It is also good practice to by clear and put a comma
after i, but this is not actually needed. Basically,
commands should look like this:
-
chorales[[i, ]](records) -
chorales[[ , j]](spines) -
chorales[[i , j]](records and spines)
Numeric indices (for double-brackets)
Numeric values i or j
can be given to double-bracket humdrum\(_{\mathbb{R}}\) index commands. For
i, the number is simply matched to record numbers in each
file. For example, you could extract the first fifty records from each
file as so:
chorales[[1:50, ]]
> ######################## vvv chor001.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern **kern **kern **kern
> 9: *ICvox *ICvox *ICvox *ICvox
> 10: *Ibass *Itenor *Ialto *Isoprn
> 11: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A *>A
> 15: *clefF4 *clefGv2 *clefG2 *clefG2
> 16: *k[f#] *k[f#] *k[f#] *k[f#]
> 17: *G: *G: *G: *G:
> 18: *M3/4 *M3/4 *M3/4 *M3/4
> 19: *MM100 *MM100 *MM100 *MM100
> 20: 4GG 4B 4d 4g
> 21: =1 =1 =1 =1
> 22: 4G 4B 4d 2g
> 23: 4E 8cL 4e .
> 24: . 8BJ . .
> 25: 4F# 4A 4d 4dd
> 26: =2 =2 =2 =2
> 27: 4G 4G 2d 4.b
> 28: 4D 4F# . .
> 29: . . . 8a
> 30: 4E 4G 4B 4g
> 31-124::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor001.krn ^^^ #########################
>
> (eight more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-21::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 22: 4C 4A 4e 4e
> 23: 4BB 4d 4g# 4b
> 24: =2 =2 =2 =2
> 25: 4AA 4e 4a 4cc
> 26: 4BB 4d 8gnXL 8bL
> 27: . . 8f#J 8aJ
> 28: 8CL 8eL 4e 4g
> 29: 8BBJ 8dJ . .
> 30: 4AA 4c 4f# 4a
> 31: =3 =3 =3 =3
> 32: 2E; 2B; 2g#; 2b;
> 33: 2E 2e 2g# 2b
> 34: =4 =4 =4 =4
> 35: 4A 4e 4a 4cc
> 36: 8GL 4f 4b 4dd
> 37: 8FJ . . .
> 38: 4E 4g 4cc 8ccL
> 39: . . . 8bJ
> 40: 4F 4c 4f 4a
> 41: =5 =5 =5 =5
> 42: 4C 8cL 4e 4g
> 43: . 8BJ . .
> 44: 4D 4A 8dL 4f
> 45: . . 8cJ .
> 46: 2E; 2G#; 2B; 2e;
> 47: =6:|! =6:|! =6:|! =6:|!
> 48: *>B *>B *>B *>B
> 49: 2c 2A 2e 2a
> 50: 4B 4B 4d 4gnX
> 91: *- *- *- *-
> ######################## ^^^ chor010.krn ^^^ #########################
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> *Token :: characterFor j, the number is matched to the spines in each file
(from left to right). So if you wanted the second spine in each file,
you’d write:
chorales[[ , 2]]
> #### vvv chor001.krn vvv ####
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern
> 9: *ICvox
> 10: *Itenor
> 11: *I"Tenor
> 12: *>[A,A,B]
> 13: *>norep[A,B]
> 14: *>A
> 15: *clefGv2
> 16: *k[f#]
> 17: *G:
> 18: *M3/4
> 19: *MM100
> 20: 4B
> 21: =1
> 22: 4B
> 23: 8cL
> 24: 8BJ
> 25: 4A
> 26: =2
> 27: 4G
> 28: 4F#
> 29: .
> 30: 4G
> 31-133:::::::::::::::::::::::
> #### ^^^ chor001.krn ^^^ ####
>
> (eight more pieces...)
>
> #### vvv chor010.krn vvv ####
> 1-70:::::::::::::::::::::::
> 71: 8F#
> 72: 4G
> 73: .
> 74: 8F#
> 75: 2G;
> 76: =11
> 77: 2G
> 78: 4A
> 79: 4G#
> 80: .
> 81: =12
> 82: 4A
> 83: 4G
> 84: 4G
> 85: 4A
> 86: =13
> 87: 4B
> 88: 4A
> 89: 2G#X;
> 90: ==
> 91: *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> #### ^^^ chor010.krn ^^^ ####
> (***four global comments truncated
> due to screen size***)
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> *Token :: characterIf you give indices that are larger than the number of records or spines in a file, that file will be dropped. For example, if we call
chorales[[150:200, ]]
> ######################## vvv chor005.krn vvv #########################
> 7: **kern **kern **kern **kern
> 11: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 12: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 13: *>A *>A *>A *>A
> 52: *>B *>B *>B *>B
> 150: 4GG . 4g 8ccL
> 151: . . . 8bJ
> 152: 8CL 8eL 4g 4a
> 153: 8BBJ 8dJ . .
> 154: 4AA 4c [4g 8bL
> 155: . . . 8ccJ
> 156: =17 =17 =17 =17
> 157: 8DL 8dL 4g] 2a
> 158: 8CJ 8eJ . .
> 159: 4D 8dL 4f# .
> 160: . 8cJ . .
> 161: 4GG; 4B; 4d; 4g;
> 162: == == == ==
> 163: *- *- *- *-
> 164: !!!hum2abc: -Q ''
> 165: !!!title: @{PC#}. @{OTL@@DE}
> 166: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian ***
> 167: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&***
> 168: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371***
> 169: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.***
> 170: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 171: !!!EED: Craig Stuart Sapp
> 172: !!!EEV: 2009/05/22
> ######################## ^^^ chor005.krn ^^^ #########################
>
> (one other piece...)
>
> ######################## vvv chor008.krn vvv #########################
>
> 7: **kern **kern **kern **kern
> 150: 8F 4f 8a-L 4cc
> 151: 8GJ . 8b-J .
> 152: 8A-L 4c 4cc 4ff
> 153: 8G . . .
> 154: 8A- 4F 8b-L 4ff
> 155: 8B-J . 8a-J .
> 156: =20 =20 =20 =20
> 157: 4c 4c 4g 4ee
> 158: 4C 4c 4g 4ee
> 159: 4F 4c 4a 4ff
> 160: 4F; 4c; 4a; 4ff;
> 161: == == == ==
> 162: *- *- *- *-
> 163: !!!hum2abc: -Q ''
> 164: !!!title: @{PC#}. @{OTL@@DE}
> 165: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian ***
> 166: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&***
> 167: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371***
> 168: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.***
> 169: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 170: !!!EED: Craig Stuart Sapp
> 171: !!!EEV: 2009/05/22
> ######################## ^^^ chor008.krn ^^^ #########################
> (***eight global comments truncated due to screen size***)
>
> humdrumR corpus of three pieces.
>
> Data fields:
> *Token :: characterWe only get three files back, because the other seven files don’t
have any records above 150! (Notice that humdrum\(_{\mathbb{R}}\) won’t remove the Exclusive
interpretation or spine spine closing (*-) records…since
that would break the humdrum syntax.)
Character indices (for double-brackets)
Character string values i or
j can also be given to double-bracket humdrum\(_{\mathbb{R}}\) index commands.
Humdrum\(_{\mathbb{R}}\) will treat
string as a regular expression and return all records (i)
or spines (j) that any match to that expression in a data
token—even if there is only one. For example, let’s (again) say we are
interesting in studying flats. Since **kern represents
flats as “-”, we can find records that contain a flat by
calling:
chorales[['-', ]]
> ######################## vvv chor003.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Ach Gott, vom Himmel sieh darein
> 4: !!!OTL@EN: Oh God, look down from Heaven
> 5: !!!OPR: Cantata BWV 153: Schau, lieber Gott, wie meine Feind
> 6: !!!SCT: BWV 153/1
> 7: !!!PC#: 3
> 8: !!!AGN: chorale
> 9: **kern **kern **kern **kern
> 10: *ICvox *ICvox *ICvox *ICvox
> 11: *Ibass *Itenor *Ialto *Isoprn
> 12: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 13: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 14: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 15: *>A *>A *>A *>A
> 16: *clefF4 *clefGv2 *clefG2 *clefG2
> 17: *k[f#] *k[f#] *k[f#] *k[f#]
> 18: *a: *a: *a: *a:
> 19: !dorian !dorian !dorian !dorian
> 20: *M4/4 *M4/4 *M4/4 *M4/4
> 21: *met(c) *met(c) *met(c) *met(c)
> 22: *MM100 *MM100 *MM100 *MM100
> 23-53: =====1-4 =====1-4 =====1-4 =====1-4
> 54: *>B *>B *>B *>B
> 55-91: =====5-9 =====5-9 =====5-9 =====5-9
> 92: 8DL 4B- 4g 4ee
> 93: . . . .
> 94: =10 =10 =10 =10
> 95: . . . .
> 96: . . . .
> 97-110::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor003.krn ^^^ #########################
>
> (three more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-36::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 37: . . . .
> 38: . . . .
> 39: . . . .
> 40: . . . .
> 41: =5 =5 =5 =5
> 42: . . . .
> 43: . . . .
> 44: . . . .
> 45: . . . .
> 46: . . . .
> 47: =6:|! =6:|! =6:|! =6:|!
> 48: *>B *>B *>B *>B
> 49-83: ======7-12 ======7-12 ======7-12 ======7-12
> 84: 4BB- 4G [2d 4g
> 85: . . . .
> 86: =13 =13 =13 =13
> 87: . . . .
> 88: . . . .
> 89: . . . .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastia***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und ***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 3***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., ***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***five global comments truncated due to screen size***)
>
> humdrumR corpus of five pieces.
>
> Data fields:
> *Token :: characterAs with our single-bracket search for flats (previous section) we only get five files back, because only five of the chorales contain any flats at all. However, we now see that all records that don’t contain a flat are completely stripped away, leaving a (handful) of records with at least one flat.
If we do the same thing with j (spines)
chorales[[ , '-']]
> #### vvv chor003.krn vvv ####
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Ach Gott, vom Himmel sieh darein
> 4: !!!OTL@EN: Oh God, look down from Heaven
> 5: !!!OPR: Cantata BWV 153: Schau, lieber Gott, wie meine Feind
> 6: !!!SCT: BWV 153/1
> 7: !!!PC#: 3
> 8: !!!AGN: chorale
> 9: **kern
> 10: *ICvox
> 11: *Itenor
> 12: *I"Tenor
> 13: *>[A,A,B]
> 14: *>norep[A,B]
> 15: *>A
> 16: *clefGv2
> 17: *k[f#]
> 18: *a:
> 19: !dorian
> 20: *M4/4
> 21: *met(c)
> 22: *MM100
> 23: 4e
> 24: =1
> 25: 4e
> 26: 4d
> 27: 4e
> 28: 8dL
> 29: 8cJ
> 30: =2
> 31-110:::::::::::::::::::::::
> #### ^^^ chor003.krn ^^^ ####
>
> (three more pieces...)
>
> #### vvv chor010.krn vvv ####
> 1-70:::::::::::::::::::::::
> 71: 4D
> 72: .
> 73: 4D
> 74: .
> 75: 2GG;
> 76: =11
> 77: 2C
> 78: 4AA
> 79: 4E
> 80: .
> 81: =12
> 82: 4F
> 83: 4C
> 84: 4BB-
> 85: 4AA
> 86: =13
> 87: 4GG#
> 88: 4AA
> 89: 2EE;
> 90: ==
> 91: *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> #### ^^^ chor010.krn ^^^ ####
> (***four global comments truncated
> due to screen size***)
>
> humdrumR corpus of five pieces.
>
> Data fields:
> *Token :: characterIt looks like we get only one spine in each of our five files. Those
single spines are simply which ever spine in each file
contained any flat. But a couple things to notice! In the first
file, what is now spine 1 was the old spine 2,
which we can tell because that instrument interpretation is
*Itenor. However, if you look at the last of the five
files
chorales[[ , '-']][5]
> #### vvv chor010.krn vvv ####
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus tiefer Not schrei ich zu dir
> 4: !!!SCT: BWV 38/6
> 5: !!!PC#: 10
> 6: !!!AGN: chorale
> 7: **kern
> 8: *ICvox
> 9: *Ibass
> 10: *I"Bass
> 11: *>[A,A,B]
> 12: *>norep[A,B]
> 13: *>A
> 14: *clefF4
> 15: *k[]
> 16: *a:
> 17: *M4/4
> 18: *met(c)
> 19: *MM100
> 20: =1-
> 21: 2D
> 22: 4C
> 23: 4BB
> 24: =2
> 25: 4AA
> 26: 4BB
> 27: .
> 28: 8CL
> 29: 8BBJ
> 30: 4AA
> 31: =3
> 32: 2E;
> 33: 2E
> 34: =4
> 35: 4A
> 36: 8GL
> 37: 8FJ
> 38: 4E
> 39: .
> 40: 4F
> 41: =5
> 42: 4C
> 43: .
> 44: 4D
> 45: .
> 46: 2E;
> 47: =6:|!
> 48: *>B
> 49: 2c
> 50: 4B
> 51: 4A
> 52: .
> 53: =7
> 54: 4G
> 55: 8FnXL
> 56: 8EJ
> 57: 4D
> 58: .
> 59: 4E
> 60: =8
> 61: 2AA;
> 62: 2A
> 63: =9
> 64: 4E
> 65: 8DL
> 66: 8CJ
> 67: 4BB
> 68: .
> 69: 4C
> 70: =10
> 71: 4D
> 72: .
> 73: 4D
> 74: .
> 75: 2GG;
> 76: =11
> 77: 2C
> 78: 4AA
> 79: 4E
> 80: .
> 81: =12
> 82: 4F
> 83: 4C
> 84: 4BB-
> 85: 4AA
> 86: =13
> 87: 4GG#
> 88: 4AA
> 89: 2EE;
> 90: ==
> 91: *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> #### ^^^ chor010.krn ^^^ ####
> (***four global comments truncated
> due to screen size***)
>
> Data fields:
> *Token :: characterwe see *Ibass—so the new spine 1 was
actually the original spine 1 in that file. And wait,
there’s more! If we dig in and look at the other files returned to us
(which aren’t shown by default),
chorales[[ , '-']][3]
> ######################## vvv chor006.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Christus, der ist mein Leben
> 4: !!!SCT: BWV 281
> 5: !!!PC#: 6
> 6: !!!AGN: chorale
> 7: **kern **kern **kern **kern
> 8: *ICvox *ICvox *ICvox *ICvox
> 9: *Ibass *Itenor *Ialto *Isoprn
> 10: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 11: *clefF4 *clefGv2 *clefG2 *clefG2
> 12: *k[b-] *k[b-] *k[b-] *k[b-]
> 13: *F: *F: *F: *F:
> 14: *M4/4 *M4/4 *M4/4 *M4/4
> 15: *met(c) *met(c) *met(c) *met(c)
> 16: *MM100 *MM100 *MM100 *MM100
> 17: 4FF 4A 4c 4f
> 18: =1 =1 =1 =1
> 19: 4F 4c 4f 4a
> 20: 4E 4c 4g 4g
> 21: 4E- 4c 4f 4a
> 22: 4D 4d 4f 4b-
> 23: =2 =2 =2 =2
> 24: 8CL 4G 8eL 2cc
> 25: 8D . 8f .
> 26: 8E 4c 8g .
> 27: 8CJ . 8eJ .
> 28: 4F; 4c; 4f; 4a;
> 29: 4BB- 4B- 4f 4dd
> 30: =3 =3 =3 =3
> 31: 4AA 4c 4.f 4cc
> 32: 4GG 8dL . 4b-
> 33: . 8B-J 8e .
> 34: 8FFL 4c 4.f 4a
> 35: 8AAJ . . .
> 36: 4C 4c . 4g
> 37: . . 8e .
> 38: =4 =4 =4 =4
> 39: 2FF; 2c; 2f; 2a;
> 40: 4r 4ry 4ry 4r
> 41: 4A 4f [4a 4cc
> 42: =5 =5 =5 =5
> 43: 4BB 4f 8aL] 4dd
> 44: . . [8gJ .
> 45: 4C [4e 8gL] 4ee
> 46: . . 16ccLL .
> 47: . . 16b-XJJ .
> 48: 8DL 8eL] 4a 4ff
> 49: 8FJ 8dJ . .
> 50: 8AL [4c 4a 4ee
> 51: 8GJ . . .
> 52: =6 =6 =6 =6
> 53: 8FL 4c] 4a 2dd
> 54: 8DJ . . .
> 55: 4G 4B 4g .
> 56: 4C; 4e; 4g; 4cc;
> 57: 4FF 4c [4f 4a
> 58: =7 =7 =7 =7
> 59: 4GG 4B-X 8fL] 4b-
> 60: . . 8eJ .
> 61: 4AA 4c 4f 4a
> 62: 4BB- 4d 4f 4g
> 63: 4C 8.cL 4e 4g
> 64: . 16B-Jk . .
> 65: =8 =8 =8 =8
> 66: 2.FF; 2.A; 2.c; 2.f;
> 67: == == == ==
> 68: *- *- *- *-
> 69: !!!hum2abc: -Q ''
> 70: !!!title: @{PC#}. @{OTL@@DE}
> 71: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 72: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 73: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 74: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 75: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 76: !!!EED: Craig Stuart Sapp
> 77: !!!EEV: 2009/05/22
> ######################## ^^^ chor006.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> Data fields:
> *Token :: characterwe see that what is now the third file actually had flats in all four spines, and so all four spines are still there!
In some cases you may find the renumbering of spines on a per
file basis confusing, and you want to keep track of the original
spine numbers. Fortunately, for you there is an option that might
helpful, which you will learn more about below: try specifying
drop = FALSE. (The drop argument is less
intuitive, but is the standard R argument for this sort of thing.)
chorales[[ , '-', drop = FALSE]]
> ######################## vvv chor003.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Ach Gott, vom Himmel sieh darein
> 4: !!!OTL@EN: Oh God, look down from Heaven
> 5: !!!OPR: Cantata BWV 153: Schau, lieber Gott, wie meine Feind
> 6: !!!SCT: BWV 153/1
> 7: !!!PC#: 3
> 8: !!!AGN: chorale
> 9: **kern **kern **kern **kern
> 10: *ICvox *ICvox *ICvox *ICvox
> 11: *Ibass *Itenor *Ialto *Isoprn
> 12: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 13: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 14: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 15: *>A *>A *>A *>A
> 16: *clefF4 *clefGv2 *clefG2 *clefG2
> 17: *k[f#] *k[f#] *k[f#] *k[f#]
> 18: *a: *a: *a: *a:
> 19: !dorian !dorian !dorian !dorian
> 20: *M4/4 *M4/4 *M4/4 *M4/4
> 21: *met(c) *met(c) *met(c) *met(c)
> 22: *MM100 *MM100 *MM100 *MM100
> 23: . 4e . .
> 24: =1 =1 =1 =1
> 25: . 4e . .
> 26: . 4d . .
> 27: . 4e . .
> 28: . 8dL . .
> 29: . 8cJ . .
> 30: =2 =2 =2 =2
> 31-110::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor003.krn ^^^ #########################
>
> (three more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-70::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: 4D . . .
> 72: . . . .
> 73: 4D . . .
> 74: . . . .
> 75: 2GG; . . .
> 76: =11 =11 =11 =11
> 77: 2C . . .
> 78: 4AA . . .
> 79: 4E . . .
> 80: . . . .
> 81: =12 =12 =12 =12
> 82: 4F . . .
> 83: 4C . . .
> 84: 4BB- . . .
> 85: 4AA . . .
> 86: =13 =13 =13 =13
> 87: 4GG# . . .
> 88: 4AA . . .
> 89: 2EE; . . .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of five pieces.
>
> Data fields:
> *Token :: characterNegative numeric indices
A nifty feature of R is that if you supply negative numbers to an indexer, R will remove those numbers. This works in humdrum\(_{\mathbb{R}}\) too, so if you want all the files except the first file, you could write:
chorales[-1]
> ######################## vvv chor002.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Ich dank dir, lieber Herre
> 4: !!!SCT: BWV 347
> 5: !!!PC#: 2
> 6: !!!AGN: chorale
> 7: **kern **kern **kern **kern
> 8: *ICvox *ICvox *ICvox *ICvox
> 9: *Ibass *Itenor *Ialto *Isoprn
> 10: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 11: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 12: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 13: *>A *>A *>A *>A
> 14: *clefF4 *clefGv2 *clefG2 *clefG2
> 15: *k[f#c#g#] *k[f#c#g#] *k[f#c#g#] *k[f#c#g#]
> 16: *A: *A: *A: *A:
> 17: *M4/4 *M4/4 *M4/4 *M4/4
> 18: *met(c) *met(c) *met(c) *met(c)
> 19: *MM100 *MM100 *MM100 *MM100
> 20: 8AL 4c# 4e 4a
> 21: 8G#J . . .
> 22: =1 =1 =1 =1
> 23: 4F# 4c# 4f# 4a
> 24: 4C# 8c#L 4e 4a
> 25: . 8BJ . .
> 26: 4D 8AL 4f# 4a
> 27: . 8G#J . .
> 28: 4D# 4F# 4f# 4b
> 29: =2 =2 =2 =2
> 30: 4E 4.B 4e 4g
> 31-124::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor002.krn ^^^ #########################
>
> (seven more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-70::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: 4D 8F# 4d 4b
> 72: . 4G . .
> 73: 4D . 4c 4a
> 74: . 8F# . .
> 75: 2GG; 2G; 2B; 2g;
> 76: =11 =11 =11 =11
> 77: 2C 2G 2e 2g
> 78: 4AA 4A 4e 4cc
> 79: 4E 4G# 8eL 4b
> 80: . . 8dJ .
> 81: =12 =12 =12 =12
> 82: 4F 4A 4c 4a
> 83: 4C 4G 4c 4e
> 84: 4BB- 4G [2d 4g
> 85: 4AA 4A . 4f
> 86: =13 =13 =13 =13
> 87: 4GG# 4B 4d] 1e;
> 88: 4AA 4A 4c .
> 89: 2EE; 2G#X; 2B; .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of nine pieces.
>
> Data fields:
> *Token :: characterOr if you want all the spines except the fourth spine, write
chorales[[ , -4]]
> ######################## vvv chor001.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern **kern **kern
> 9: *ICvox *ICvox *ICvox
> 10: *Ibass *Itenor *Ialto
> 11: *I"Bass *I"Tenor *I"Alto
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A
> 15: *clefF4 *clefGv2 *clefG2
> 16: *k[f#] *k[f#] *k[f#]
> 17: *G: *G: *G:
> 18: *M3/4 *M3/4 *M3/4
> 19: *MM100 *MM100 *MM100
> 20: 4GG 4B 4d
> 21: =1 =1 =1
> 22: 4G 4B 4d
> 23: 4E 8cL 4e
> 24: . 8BJ .
> 25: 4F# 4A 4d
> 26: =2 =2 =2
> 27: 4G 4G 2d
> 28: 4D 4F# .
> 29: . . .
> 30: 4E 4G 4B
> 31-133::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor001.krn ^^^ #########################
>
> (eight more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-70::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: 4D 8F# 4d
> 72: . 4G .
> 73: 4D . 4c
> 74: . 8F# .
> 75: 2GG; 2G; 2B;
> 76: =11 =11 =11
> 77: 2C 2G 2e
> 78: 4AA 4A 4e
> 79: 4E 4G# 8eL
> 80: . . 8dJ
> 81: =12 =12 =12
> 82: 4F 4A 4c
> 83: 4C 4G 4c
> 84: 4BB- 4G [2d
> 85: 4AA 4A .
> 86: =13 =13 =13
> 87: 4GG# 4B 4d]
> 88: 4AA 4A 4c
> 89: 2EE; 2G#X; 2B;
> 90: == == ==
> 91: *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> *Token :: characterOr if you want to remove the first 20 records from each file:
chorales[[-1:-20, ]]
> ######################## vvv chor001.krn vvv #########################
> 8: **kern **kern **kern **kern
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A *>A
> 21: =1 =1 =1 =1
> 22: 4G 4B 4d 2g
> 23: 4E 8cL 4e .
> 24: . 8BJ . .
> 25: 4F# 4A 4d 4dd
> 26: =2 =2 =2 =2
> 27: 4G 4G 2d 4.b
> 28: 4D 4F# . .
> 29: . . . 8a
> 30: 4E 4G 4B 4g
> 31: =3 =3 =3 =3
> 32: 4C 8cL 8eL 4.g
> 33: . 8BJ 8d .
> 34: 8BBL 4c 8e .
> 35: 8AAJ . 8f#J 8a
> 36: 4GG 4d 4g 4b
> 37: =4 =4 =4 =4
> 38: 2D; 2d; 2f#; 2a;
> 39: 4GG 4d 4g 4b
> 40: =5 =5 =5 =5
> 41: 4FF# 4A 4d 2dd
> 42: 4GG 4B 4e .
> 43: 4AA 4c 4f# 4cc
> 44: =6 =6 =6 =6
> 45: 4BB 4d 2g 4b
> 46: 4C 4e . 2a
> 47-133::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor001.krn ^^^ #########################
>
> (eight more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 7-70::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: 4D 8F# 4d 4b
> 72: . 4G . .
> 73: 4D . 4c 4a
> 74: . 8F# . .
> 75: 2GG; 2G; 2B; 2g;
> 76: =11 =11 =11 =11
> 77: 2C 2G 2e 2g
> 78: 4AA 4A 4e 4cc
> 79: 4E 4G# 8eL 4b
> 80: . . 8dJ .
> 81: =12 =12 =12 =12
> 82: 4F 4A 4c 4a
> 83: 4C 4G 4c 4e
> 84: 4BB- 4G [2d 4g
> 85: 4AA 4A . 4f
> 86: =13 =13 =13 =13
> 87: 4GG# 4B 4d] 1e;
> 88: 4AA 4A 4c .
> 89: 2EE; 2G#X; 2B; .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> *Token :: character(Again, humdrum\(_{\mathbb{R}}\)
won’t remove the Exclusive interpretation or spine spine closing
(*-) records…since that would break the humdrum
syntax.)
General Filtering
The indexing commands (previous sections) only get you so far. If you
want to be more precise about filtering, use the tidy-verse
filter() method for humdrum\(_{\mathbb{R}}\) data. filter()
works exactly like mutate.humdrumR. However, the
expression(s) you give must evaluate to a logical vector
(TRUE or FALSE), or you will get an error
otherwise. filter() will take your logical result and
filter out data which matches FALSE.
We can reproduce the functionality of the [] and
[[]] indexing operators (previous section) using
filter():
chorales |>
filter(Spine == 1)
> ######################## vvv chor001.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern **kern **kern **kern
> 9: *ICvox *ICvox *ICvox *ICvox
> 10: *Ibass *Itenor *Ialto *Isoprn
> 11: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A *>A
> 15: *clefF4 *clefGv2 *clefG2 *clefG2
> 16: *k[f#] *k[f#] *k[f#] *k[f#]
> 17: *G: *G: *G: *G:
> 18: *M3/4 *M3/4 *M3/4 *M3/4
> 19: *MM100 *MM100 *MM100 *MM100
> 20: 4GG . . .
> 21: =1 =1 =1 =1
> 22: 4G . . .
> 23: 4E . . .
> 24: . . . .
> 25: 4F# . . .
> 26: =2 =2 =2 =2
> 27: 4G . . .
> 28: 4D . . .
> 29: . . . .
> 30: 4E . . .
> 31-133::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor001.krn ^^^ #########################
>
> (eight more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-70::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: 4D . . .
> 72: . . . .
> 73: 4D . . .
> 74: . . . .
> 75: 2GG; . . .
> 76: =11 =11 =11 =11
> 77: 2C . . .
> 78: 4AA . . .
> 79: 4E . . .
> 80: . . . .
> 81: =12 =12 =12 =12
> 82: 4F . . .
> 83: 4C . . .
> 84: 4BB- . . .
> 85: 4AA . . .
> 86: =13 =13 =13 =13
> 87: 4GG# . . .
> 88: 4AA . . .
> 89: 2EE; . . .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> *Token :: characterBut, now we can filter based on any arbitrary criteria we
want. For example, we could extract tokens from odd numbered spines in
odd numbered records and even numbered spines in even numbered
records. We’ll use Rs modulo command %% to separate even
and odd numbers (odd %% 2 == 1,
even %% 2 == 0).
chorales |>
filter((Record %% 2 == 0) == (Spine %% 2 == 0))
> ######################## vvv chor001.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern **kern **kern **kern
> 9: *ICvox *ICvox *ICvox *ICvox
> 10: *Ibass *Itenor *Ialto *Isoprn
> 11: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A *>A
> 15: *clefF4 *clefGv2 *clefG2 *clefG2
> 16: *k[f#] *k[f#] *k[f#] *k[f#]
> 17: *G: *G: *G: *G:
> 18: *M3/4 *M3/4 *M3/4 *M3/4
> 19: *MM100 *MM100 *MM100 *MM100
> 20: . 4B . 4g
> 21: =1 =1 =1 =1
> 22: . 4B . 2g
> 23: 4E . 4e .
> 24: . 8BJ . .
> 25: 4F# . 4d .
> 26: =2 =2 =2 =2
> 27: 4G . 2d .
> 28: . 4F# . .
> 29: . . . .
> 30: . 4G . 4g
> 31-133::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor001.krn ^^^ #########################
>
> (eight more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-70::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: 4D . 4d .
> 72: . 4G . .
> 73: 4D . 4c .
> 74: . 8F# . .
> 75: 2GG; . 2B; .
> 76: =11 =11 =11 =11
> 77: 2C . 2e .
> 78: . 4A . 4cc
> 79: 4E . 8eL .
> 80: . . . .
> 81: =12 =12 =12 =12
> 82: . 4A . 4a
> 83: 4C . 4c .
> 84: . 4G . 4g
> 85: 4AA . . .
> 86: =13 =13 =13 =13
> 87: 4GG# . 4d] .
> 88: . 4A . .
> 89: 2EE; . 2B; .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> *Token :: characterWould we ever want to do that? Probably not. However, returning to our flats, study, lets grab all the flat notes:
chorales |>
filter(Token %~% '-')
> ######################## vvv chor003.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Ach Gott, vom Himmel sieh darein
> 4: !!!OTL@EN: Oh God, look down from Heaven
> 5: !!!OPR: Cantata BWV 153: Schau, lieber Gott, wie meine Feind
> 6: !!!SCT: BWV 153/1
> 7: !!!PC#: 3
> 8: !!!AGN: chorale
> 9: **kern **kern **kern **kern
> 10: *ICvox *ICvox *ICvox *ICvox
> 11: *Ibass *Itenor *Ialto *Isoprn
> 12: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 13: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 14: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 15: *>A *>A *>A *>A
> 16: *clefF4 *clefGv2 *clefG2 *clefG2
> 17: *k[f#] *k[f#] *k[f#] *k[f#]
> 18: *a: *a: *a: *a:
> 19: !dorian !dorian !dorian !dorian
> 20: *M4/4 *M4/4 *M4/4 *M4/4
> 21: *met(c) *met(c) *met(c) *met(c)
> 22: *MM100 *MM100 *MM100 *MM100
> 23-53: =====1-4 =====1-4 =====1-4 =====1-4
> 54: *>B *>B *>B *>B
> 55-91: =====5-9 =====5-9 =====5-9 =====5-9
> 92: . 4B- . .
> 93: . . . .
> 94: =10 =10 =10 =10
> 95: . . . .
> 96: . . . .
> 97-110::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor003.krn ^^^ #########################
>
> (three more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-36::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 37: . . . .
> 38: . . . .
> 39: . . . .
> 40: . . . .
> 41: =5 =5 =5 =5
> 42: . . . .
> 43: . . . .
> 44: . . . .
> 45: . . . .
> 46: . . . .
> 47: =6:|! =6:|! =6:|! =6:|!
> 48: *>B *>B *>B *>B
> 49-83: ======7-12 ======7-12 ======7-12 ======7-12
> 84: 4BB- . . .
> 85: . . . .
> 86: =13 =13 =13 =13
> 87: . . . .
> 88: . . . .
> 89: . . . .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastia***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und ***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 3***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., ***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***five global comments truncated due to screen size***)
>
> humdrumR corpus of five pieces.
>
> Data fields:
> *Token :: characterWoh, we’re only seeing a couple of B flats in these files! But from before, we know that there are a lot more flats in the fourth file (after losing the files with no flats):
chorales |>
filter(Token %~% '-') |>
index(4)
> ######################## vvv chor008.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Freuet euch, ihr Christen alle
> 4: !!!SCT: BWV 40/8
> 5: !!!PC#: 8
> 6: !!!AGN: chorale
> 7: **kern **kern **kern **kern
> 8: *ICvox *ICvox *ICvox *ICvox
> 9: *Ibass *Itenor *Ialto *Isoprn
> 10: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 11: *clefF4 *clefGv2 *clefG2 *clefG2
> 12: *k[b-e-a-] *k[b-e-a-] *k[b-e-a-] *k[b-e-a-]
> 13: *f:dor *f:dor *f:dor *f:dor
> 14: *M4/4 *M4/4 *M4/4 *M4/4
> 15: *met(c) *met(c) *met(c) *met(c)
> 16: *MM100 *MM100 *MM100 *MM100
> 17: =1- =1- =1- =1-
> 18: . 4A- . .
> 19: 4E- . . .
> 20: 4D- 4B- . 4b-
> 21: . . . .
> 22: . . . 4a-
> 23: =2 =2 =2 =2
> 24: 4BB- 4d- . .
> 25: . . . .
> 26: . . . .
> 27: . 8B-J . .
> 28: . 4A- . .
> 29: . 4A-; . .
> 30: =3 =3 =3 =3
> 31: . . . 4.a-
> 32: 8E-L . . .
> 33: 8D-J 8B- . 8b-
> 34: . 4e- 4a- .
> 35: 8BB-J . . .
> 36: 4AA- 4e- 4a- .
> 37: =4 =4 =4 =4
> 38: 4D- . 8a-L 4.b-
> 39: . . . .
> 40: 4E- 8e-L . .
> 41: . 8d-XJ . 8a-
> 42: 2AA-; . 2e-; 2a-;
> 43: =5 =5 =5 =5
> 44: 4D- 4d- . 4a-
> 45: . 4d- . 4b-
> 46: 8BB-J . . .
> 47: . . . 4b-
> 48: 4D- . . 4a-
> 49: . 8A-J . .
> 50: =6 =6 =6 =6
> 51: 4BB- 4d- . .
> 52: . . . .
> 53: . 8B-J . .
> 54: . 2A-; . .
> 55: =7 =7 =7 =7
> 56: . . . .
> 57: . 8B-J . .
> 58: . . . .
> 59: . . . .
> 60: 8BB-L 4B- . 4dd-
> 61: . . . .
> 62: 8D- 4B- . 4dd-
> 63: 8BB-J . . .
> 64: =8 =8 =8 =8
> 65: 8E-L 4B- . 4b-
> 66: . . 8a-XJ .
> 67: . 4e- 8b-L 4b-
> 68: 8E-J . . .
> 69: 4A- 4e- 4a- .
> 70: 4A-; 4e-; 4a-; .
> 71: =9 =9 =9 =9
> 72: 8D-L 4d- . 4a-
> 73: 8E- . . .
> 74: . 4d- . 4a-
> 75: 8D-J . . .
> 76: 8BB-L . 4b- 4dd-
> 77: . . . .
> 78: 8D- . 4b- 4dd-
> 79: 8BB-J . . .
> 80: =10 =10 =10 =10
> 81: 8E-L 4g- 4b- .
> 82: . . . .
> 83: . . . .
> 84: . 8e-J . .
> 85: 2BB-; 2d-; . 2b-;
> 86: =11 =11 =11 =11
> 87: 4B- . . .
> 88: 4A- . . 4a-X
> 89: . 4B- . 4b-
> 90: . . . .
> 91: . . . 4a-
> 92: =12 =12 =12 =12
> 93: 4BB- 4d- . .
> 94: . . . .
> 95: . 8B-J . .
> 96: . 2A-; . .
> 97: =13 =13 =13 =13
> 98: . . 4a- .
> 99: . . . .
> 100: 8AA- . 4a- .
> 101: 8BB-J . . .
> 102: . . . 4ee-X
> 103: . . . .
> 104: 8E- . . 4ee-
> 105: . . . .
> 106: =14 =14 =14 =14
> 107: . . . .
> 108: . . 8a-J .
> 109: . . . .
> 110: . . . .
> 111: . . . .
> 112: . . . .
> 113: =15 =15 =15 =15
> 114: . . . .
> 115: 8E- . . .
> 116: 8D- . . .
> 117: . . . .
> 118: 4BB- 4B- . 4dd-
> 119: . . . .
> 120: . 4E- 4a- .
> 121: 8D-J . . .
> 122: =16 =16 =16 =16
> 123: 4E- 4.e- 8a-L 4.b-
> 124: . . . .
> 125: 4E- . . .
> 126: . 8d- . 8a-
> 127: 4AA- . 4e- 4a-
> 128: 4AA-; . 4e-; 4a-;
> 129: =17 =17 =17 =17
> 130: 8D-L 4d- . 4a-
> 131: 8E- . . .
> 132: 8D- 4d- . 4a-
> 133: . . . .
> 134: 8BB-L . 4b- 4dd-
> 135: . . . .
> 136: 8D- . 4b- 4dd-
> 137: 8BB-J . . .
> 138: =18 =18 =18 =18
> 139: 8E-L 4e- . 4b-
> 140: . . . .
> 141: 8E- 4e- . 4b-
> 142: 8D-J . . .
> 143: . . . 4ee-
> 144: 8D- . . .
> 145: 8E- . . 4ee-
> 146: . . . .
> 147: =19 =19 =19 =19
> 148: . . 8a-L .
> 149: . . . .
> 150: . . 8a-L .
> 151: . . 8b-J .
> 152: 8A-L . . .
> 153: . . . .
> 154: 8A- . 8b-L .
> 155: 8B-J . 8a-J .
> 156: =20 =20 =20 =20
> 157: . . . .
> 158: . . . .
> 159: . . . .
> 160: . . . .
> 161: == == == ==
> 162: *- *- *- *-
> 163: !!!hum2abc: -Q ''
> 164: !!!title: @{PC#}. @{OTL@@DE}
> 165: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian ***
> 166: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&***
> 167: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371***
> 168: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.***
> 169: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 170: !!!EED: Craig Stuart Sapp
> 171: !!!EEV: 2009/05/22
> ######################## ^^^ chor008.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> Data fields:
> *Token :: characterSubseting by Group
Like mutate(), filter() will evaluate its
logical filtering expression within groups created by
group_by(). This can be a useful way to get some context
for our searches. For example, let’s say we want to find flats again,
but we want to see the whole bar of music that contains a flat.
We can do this by grouping by the Bar field (and the
Piece field, of course). We’ll want to say “within each
bar, if there are any flats, return TRUE for the
whole bar, else return FALSE for the
whole bar.” By default, filter() will
[recycle][recycling] scalar results, so if you return a single
TRUE/FALSE, it will be recycled to fill the
whole group.
chorales |>
group_by(Piece, Bar) |>
filter(any(Token %~% '-'))
> ######################## vvv chor003.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Ach Gott, vom Himmel sieh darein
> 4: !!!OTL@EN: Oh God, look down from Heaven
> 5: !!!OPR: Cantata BWV 153: Schau, lieber Gott, wie meine Feind
> 6: !!!SCT: BWV 153/1
> 7: !!!PC#: 3
> 8: !!!AGN: chorale
> 9: **kern **kern **kern **kern
> 10: *ICvox *ICvox *ICvox *ICvox
> 11: *Ibass *Itenor *Ialto *Isoprn
> 12: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 13: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 14: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 15: *>A *>A *>A *>A
> 16: *clefF4 *clefGv2 *clefG2 *clefG2
> 17: *k[f#] *k[f#] *k[f#] *k[f#]
> 18: *a: *a: *a: *a:
> 19: !dorian !dorian !dorian !dorian
> 20: *M4/4 *M4/4 *M4/4 *M4/4
> 21: *met(c) *met(c) *met(c) *met(c)
> 22: *MM100 *MM100 *MM100 *MM100
> 23-53: =====1-4 =====1-4 =====1-4 =====1-4
> 54: *>B *>B *>B *>B
> 55-86: =====5-9 =====5-9 =====5-9 =====5-9
> 87: 4G# 4B 4e 4ee
> 88: 8AL 4A 4e 4cc
> 89: 8GJ . . .
> 90: 8FL 4A 4f 4dd
> 91: 8EJ . . .
> 92-110::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor003.krn ^^^ #########################
>
> (three more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-38::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 39: . . . .
> 40: . . . .
> 41: =5 =5 =5 =5
> 42: . . . .
> 43: . . . .
> 44: . . . .
> 45: . . . .
> 46: . . . .
> 47: =6:|! =6:|! =6:|! =6:|!
> 48: *>B *>B *>B *>B
> 49-81: ======7-12 ======7-12 ======7-12 ======7-12
> 82: 4F 4A 4c 4a
> 83: 4C 4G 4c 4e
> 84: 4BB- 4G [2d 4g
> 85: 4AA 4A . 4f
> 86: =13 =13 =13 =13
> 87: . . . .
> 88: . . . .
> 89: . . . .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastia***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und ***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 3***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., ***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***five global comments truncated due to screen size***)
>
> humdrumR corpus of five pieces.
>
> Data fields:
> *Token :: character
>
> Grouping fields: (twenty-seven groups)
> Bar :: integer
> Piece :: integerNot enough context for you? Maybe we should group the bars into even-odd pairs:
chorales |>
group_by(Piece, floor(Bar / 2)) |>
filter(any(Token %~% '-'))
> ######################## vvv chor003.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Ach Gott, vom Himmel sieh darein
> 4: !!!OTL@EN: Oh God, look down from Heaven
> 5: !!!OPR: Cantata BWV 153: Schau, lieber Gott, wie meine Feind
> 6: !!!SCT: BWV 153/1
> 7: !!!PC#: 3
> 8: !!!AGN: chorale
> 9: **kern **kern **kern **kern
> 10: *ICvox *ICvox *ICvox *ICvox
> 11: *Ibass *Itenor *Ialto *Isoprn
> 12: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 13: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 14: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 15: *>A *>A *>A *>A
> 16: *clefF4 *clefGv2 *clefG2 *clefG2
> 17: *k[f#] *k[f#] *k[f#] *k[f#]
> 18: *a: *a: *a: *a:
> 19: !dorian !dorian !dorian !dorian
> 20: *M4/4 *M4/4 *M4/4 *M4/4
> 21: *met(c) *met(c) *met(c) *met(c)
> 22: *MM100 *MM100 *MM100 *MM100
> 23-53: =====1-4 =====1-4 =====1-4 =====1-4
> 54: *>B *>B *>B *>B
> 55-86: =====5-9 =====5-9 =====5-9 =====5-9
> 87: 4G# 4B 4e 4ee
> 88: 8AL 4A 4e 4cc
> 89: 8GJ . . .
> 90: 8FL 4A 4f 4dd
> 91: 8EJ . . .
> 92-110::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor003.krn ^^^ #########################
>
> (three more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-38::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 39: . . . .
> 40: . . . .
> 41: =5 =5 =5 =5
> 42: . . . .
> 43: . . . .
> 44: . . . .
> 45: . . . .
> 46: . . . .
> 47: =6:|! =6:|! =6:|! =6:|!
> 48: *>B *>B *>B *>B
> 49-81: ======7-12 ======7-12 ======7-12 ======7-12
> 82: 4F 4A 4c 4a
> 83: 4C 4G 4c 4e
> 84: 4BB- 4G [2d 4g
> 85: 4AA 4A . 4f
> 86: =13 =13 =13 =13
> 87: 4GG# 4B 4d] 1e;
> 88: 4AA 4A 4c .
> 89: 2EE; 2G#X; 2B; .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastia***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und ***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 3***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., ***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***five global comments truncated due to screen size***)
>
> humdrumR corpus of five pieces.
>
> Data fields:
> *Token :: character
>
> Grouping fields: (seventeen groups)
> floor(Bar/2) :: numeric
> Piece :: integerRemoving vs Filtering
You probably noticed that, unlike the indexing commands
[] and [[]], filter() doesn’t
seem to actually remove data that you filter out. So when we
say
chorales |>
filter(Spine == 1)
> ######################## vvv chor001.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern **kern **kern **kern
> 9: *ICvox *ICvox *ICvox *ICvox
> 10: *Ibass *Itenor *Ialto *Isoprn
> 11: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A *>A
> 15: *clefF4 *clefGv2 *clefG2 *clefG2
> 16: *k[f#] *k[f#] *k[f#] *k[f#]
> 17: *G: *G: *G: *G:
> 18: *M3/4 *M3/4 *M3/4 *M3/4
> 19: *MM100 *MM100 *MM100 *MM100
> 20: 4GG . . .
> 21: =1 =1 =1 =1
> 22: 4G . . .
> 23: 4E . . .
> 24: . . . .
> 25: 4F# . . .
> 26: =2 =2 =2 =2
> 27: 4G . . .
> 28: 4D . . .
> 29: . . . .
> 30: 4E . . .
> 31-133::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor001.krn ^^^ #########################
>
> (eight more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-70::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: 4D . . .
> 72: . . . .
> 73: 4D . . .
> 74: . . . .
> 75: 2GG; . . .
> 76: =11 =11 =11 =11
> 77: 2C . . .
> 78: 4AA . . .
> 79: 4E . . .
> 80: . . . .
> 81: =12 =12 =12 =12
> 82: 4F . . .
> 83: 4C . . .
> 84: 4BB- . . .
> 85: 4AA . . .
> 86: =13 =13 =13 =13
> 87: 4GG# . . .
> 88: 4AA . . .
> 89: 2EE; . . .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> *Token :: characterwe still have four spines, but spines 2–4 are just emptied. This is
correct. What filter() actually does is turn any filtered
data points into null (d) data points. Humdrum\(_{\mathbb{R}}\) then ignores that data
automatically. Why do we do this? There are several reasons:
- Sometimes, seeing the full structure remain in place is
cleaner/easier to interpret than actually removing them. Basically, all
those empty spines remind you what you filtered, so it is easier to see
if the filter is doing what you think it is doing.
- A clear example of this is when we did
[[ , j]]indexing for flats (above): when we simply removed the spines with no flats it was hard to tell which spine was which in the result.
- A clear example of this is when we did
- Many filters would break the humdrum syntax if the data was simply removed. If you removed all the tokens that don’t contain flats, the result would be humdrum data with holes in it.
- Its possible to undo your filters, using the
unfilter()command (details below).
Once you’ve done some filtering with filter(), if you
want to get rid of empty parts of the data, you can do so using
the commands removeEmptyFiles(),
removeEmptySpines(),
removeEmptyRecords(),removeEmptyPaths(), or
removeEmptyStops(). By using this commands, we make sure
that 1) you explicitly want to remove them and 2) the humdrum syntax is
not broken, because only whole records/spines/paths/files are
removed.
So for our spines example:
chorales |>
filter(Spine == 1) |>
removeEmptySpines()
> #### vvv chor001.krn vvv ####
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern
> 9: *ICvox
> 10: *Ibass
> 11: *I"Bass
> 12: *>[A,A,B]
> 13: *>norep[A,B]
> 14: *>A
> 15: *clefF4
> 16: *k[f#]
> 17: *G:
> 18: *M3/4
> 19: *MM100
> 20: 4GG
> 21: =1
> 22: 4G
> 23: 4E
> 24: .
> 25: 4F#
> 26: =2
> 27: 4G
> 28: 4D
> 29: .
> 30: 4E
> 31-133:::::::::::::::::::::::
> #### ^^^ chor001.krn ^^^ ####
>
> (eight more pieces...)
>
> #### vvv chor010.krn vvv ####
> 1-70:::::::::::::::::::::::
> 71: 4D
> 72: .
> 73: 4D
> 74: .
> 75: 2GG;
> 76: =11
> 77: 2C
> 78: 4AA
> 79: 4E
> 80: .
> 81: =12
> 82: 4F
> 83: 4C
> 84: 4BB-
> 85: 4AA
> 86: =13
> 87: 4GG#
> 88: 4AA
> 89: 2EE;
> 90: ==
> 91: *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> #### ^^^ chor010.krn ^^^ ####
> (***four global comments truncated
> due to screen size***)
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> *Token :: characteror for records:
chorales |>
filter(Record %% 2 == 0) |>
removeEmptyRecords()
> ######################## vvv chor001.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern **kern **kern **kern
> 9: *ICvox *ICvox *ICvox *ICvox
> 10: *Ibass *Itenor *Ialto *Isoprn
> 11: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A *>A
> 15: *clefF4 *clefGv2 *clefG2 *clefG2
> 16: *k[f#] *k[f#] *k[f#] *k[f#]
> 17: *G: *G: *G: *G:
> 18: *M3/4 *M3/4 *M3/4 *M3/4
> 19: *MM100 *MM100 *MM100 *MM100
> 20: 4GG 4B 4d 4g
> 21: =1 =1 =1 =1
> 22: 4G 4B 4d 2g
> 24: . 8BJ . .
> 26: =2 =2 =2 =2
> 28: 4D 4F# . .
> 30: 4E 4G 4B 4g
> 31: =3 =3 =3 =3
> 32: 4C 8cL 8eL 4.g
> 34: 8BBL 4c 8e .
> 36: 4GG 4d 4g 4b
> 37-133::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor001.krn ^^^ #########################
>
> (eight more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-54::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 56: 8EJ 8eJ . .
> 58: . . 8aJ 8ccJ
> 60: =8 =8 =8 =8
> 62: 2A 2e 2a 2cc
> 63: =9 =9 =9 =9
> 64: 4E 4e 4g 4b
> 66: 8CJ . . .
> 68: . . 8fJ .
> 70: =10 =10 =10 =10
> 72: . 4G . .
> 74: . 8F# . .
> 76: =11 =11 =11 =11
> 78: 4AA 4A 4e 4cc
> 80: . . 8dJ .
> 81: =12 =12 =12 =12
> 82: 4F 4A 4c 4a
> 84: 4BB- 4G [2d 4g
> 86: =13 =13 =13 =13
> 88: 4AA 4A 4c .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> *Token :: characterComplements
When humdrum\(_{\mathbb{R}}\)
filters, it does not completely discard/erase the data. The output of
filter() is a subset of the original data: the
complement of that subset is retained (but hidden). This allows
us to restore the filtered data, using unfilter():
chorales |>
filter(Spine == 1) |>
unfilter()
> ######################## vvv chor001.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern **kern **kern **kern
> 9: *ICvox *ICvox *ICvox *ICvox
> 10: *Ibass *Itenor *Ialto *Isoprn
> 11: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A *>A
> 15: *clefF4 *clefGv2 *clefG2 *clefG2
> 16: *k[f#] *k[f#] *k[f#] *k[f#]
> 17: *G: *G: *G: *G:
> 18: *M3/4 *M3/4 *M3/4 *M3/4
> 19: *MM100 *MM100 *MM100 *MM100
> 20: 4GG 4B 4d 4g
> 21: =1 =1 =1 =1
> 22: 4G 4B 4d 2g
> 23: 4E 8cL 4e .
> 24: . 8BJ . .
> 25: 4F# 4A 4d 4dd
> 26: =2 =2 =2 =2
> 27: 4G 4G 2d 4.b
> 28: 4D 4F# . .
> 29: . . . 8a
> 30: 4E 4G 4B 4g
> 31-133::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor001.krn ^^^ #########################
>
> (eight more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-70::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: 4D 8F# 4d 4b
> 72: . 4G . .
> 73: 4D . 4c 4a
> 74: . 8F# . .
> 75: 2GG; 2G; 2B; 2g;
> 76: =11 =11 =11 =11
> 77: 2C 2G 2e 2g
> 78: 4AA 4A 4e 4cc
> 79: 4E 4G# 8eL 4b
> 80: . . 8dJ .
> 81: =12 =12 =12 =12
> 82: 4F 4A 4c 4a
> 83: 4C 4G 4c 4e
> 84: 4BB- 4G [2d 4g
> 85: 4AA 4A . 4f
> 86: =13 =13 =13 =13
> 87: 4GG# 4B 4d] 1e;
> 88: 4AA 4A 4c .
> 89: 2EE; 2G#X; 2B; .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> *Token :: characterWe can also expliticely switch to the complement using the
complement() command:
chorales |>
filter(Spine == 1) |>
complement()
> ######################## vvv chor001.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern **kern **kern **kern
> 9: *ICvox *ICvox *ICvox *ICvox
> 10: *Ibass *Itenor *Ialto *Isoprn
> 11: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A *>A
> 15: *clefF4 *clefGv2 *clefG2 *clefG2
> 16: *k[f#] *k[f#] *k[f#] *k[f#]
> 17: *G: *G: *G: *G:
> 18: *M3/4 *M3/4 *M3/4 *M3/4
> 19: *MM100 *MM100 *MM100 *MM100
> 20: . 4B 4d 4g
> 21: =1 =1 =1 =1
> 22: . 4B 4d 2g
> 23: . 8cL 4e .
> 24: . 8BJ . .
> 25: . 4A 4d 4dd
> 26: =2 =2 =2 =2
> 27: . 4G 2d 4.b
> 28: . 4F# . .
> 29: . . . 8a
> 30: . 4G 4B 4g
> 31-133::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor001.krn ^^^ #########################
>
> (eight more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-70::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: . 8F# 4d 4b
> 72: . 4G . .
> 73: . . 4c 4a
> 74: . 8F# . .
> 75: . 2G; 2B; 2g;
> 76: =11 =11 =11 =11
> 77: . 2G 2e 2g
> 78: . 4A 4e 4cc
> 79: . 4G# 8eL 4b
> 80: . . 8dJ .
> 81: =12 =12 =12 =12
> 82: . 4A 4c 4a
> 83: . 4G 4c 4e
> 84: . 4G [2d 4g
> 85: . 4A . 4f
> 86: =13 =13 =13 =13
> 87: . 4B 4d] 1e;
> 88: . 4A 4c .
> 89: . 2G#X; 2B; .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> *Token :: characterWhy would we want to unfilter or complement our data? These functions actually allow a number of useful functionality that is not immediately obvious.
Example 1
Let’s say we want to find and look at the notes leading up to the
third phrase ending in each chorale? We’d first need to count
the phrase endings (;) in each chorale. We could filter our
data, and simply seq_along() (enumerate) the fermatas in
each bar:
chorales |>
filter(Token %~% ';') |>
group_by(Piece, Spine) |>
mutate(FermataN = seq_along(Token)) -> chorales
chorales[1]
> ######################## vvv chor001.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern **kern **kern **kern
> 9: *ICvox *ICvox *ICvox *ICvox
> 10: *Ibass *Itenor *Ialto *Isoprn
> 11: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A *>A
> 15: *clefF4 *clefGv2 *clefG2 *clefG2
> 16: *k[f#] *k[f#] *k[f#] *k[f#]
> 17: *G: *G: *G: *G:
> 18: *M3/4 *M3/4 *M3/4 *M3/4
> 19: *MM100 *MM100 *MM100 *MM100
> 20: . . . .
> 21: =1 =1 =1 =1
> 22: . . . .
> 23: . . . .
> 24: . . . .
> 25: . . . .
> 26: =2 =2 =2 =2
> 27: . . . .
> 28: . . . .
> 29: . . . .
> 30: . . . .
> 31: =3 =3 =3 =3
> 32: . . . .
> 33: . . . .
> 34: . . . .
> 35: . . . .
> 36: . . . .
> 37: =4 =4 =4 =4
> 38: 1 1 1 1
> 39: . . . .
> 40: =5 =5 =5 =5
> 41: . . . .
> 42: . . . .
> 43: . . . .
> 44: =6 =6 =6 =6
> 45: . . . .
> 46: . . . .
> 47: . . . .
> 48: . . . .
> 49: =7 =7 =7 =7
> 50: 2 2 2 2
> 51: =:|! =:|! =:|! =:|!
> 52: *>B *>B *>B *>B
> 53: . . . .
> 54: =8 =8 =8 =8
> 55: . . . .
> 56: . . . .
> 57: . . . .
> 58: . . . .
> 59: . . . .
> 60: . . . .
> 61: =9 =9 =9 =9
> 62: . . . .
> 63: . . . .
> 64: . . . .
> 65: . . . .
> 66: . . . .
> 67: =10 =10 =10 =10
> 68: 3 3 3 3
> 69: . . . .
> 70: =11 =11 =11 =11
> 71: . . . .
> 72: . . . .
> 73: . . . .
> 74: . . . .
> 75: =12 =12 =12 =12
> 76: . . . .
> 77: . . . .
> 78: . . . .
> 79: . . . .
> 80: . . . .
> 81: =13 =13 =13 =13
> 82: . . . .
> 83: . . . .
> 84: . . . .
> 85: . . . .
> 86: =14 =14 =14 =14
> 87: 4 4 4 4
> 88: . . . .
> 89: =15 =15 =15 =15
> 90: . . . .
> 91: . . . .
> 92: . . . .
> 93: . . . .
> 94: . . . .
> 95: =16 =16 =16 =16
> 96: . . . .
> 97: . . . .
> 98: . . . .
> 99: . . . .
> 100: =17 =17 =17 =17
> 101: . . . .
> 102: . . . .
> 103: . . . .
> 104: . . . .
> 105: . . . .
> 106: . . . .
> 107: =18 =18 =18 =18
> 108: 5 5 5 5
> 109: . . . .
> 110: =19 =19 =19 =19
> 111: . . . .
> 112: . . . .
> 113: . . . .
> 114: . . . .
> 115: =20 =20 =20 =20
> 116: . . . .
> 117: . . . .
> 118: . . . .
> 119: . . . .
> 120: . . . .
> 121: =21 =21 =21 =21
> 122: 6 6 6 6
> 123: == == == ==
> 124: *- *- *- *-
> 125: !!!hum2abc: -Q ''
> 126: !!!title: @{PC#}. @{OTL@@DE}
> 127: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian ***
> 128: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&***
> 129: !!!YOR3: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371***
> 130: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.***
> 131: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 132: !!!EED: Craig Stuart Sapp
> 133: !!!EEV: 2009/05/22
> ######################## ^^^ chor001.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> Data fields:
> *FermataN :: integer
> Token :: character
>
> Grouping fields: (four groups)
> Piece :: integer
> Spine :: integerCool! We now have a FermataN field, showing us the
number of each fermata. But wait, using filter removed most of
our tokens, so we can only see the notes during the fermatas, not
leading up to them.
chorales |>
select(Token)
> ######################## vvv chor001.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern **kern **kern **kern
> 9: *ICvox *ICvox *ICvox *ICvox
> 10: *Ibass *Itenor *Ialto *Isoprn
> 11: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A *>A
> 15: *clefF4 *clefGv2 *clefG2 *clefG2
> 16: *k[f#] *k[f#] *k[f#] *k[f#]
> 17: *G: *G: *G: *G:
> 18: *M3/4 *M3/4 *M3/4 *M3/4
> 19: *MM100 *MM100 *MM100 *MM100
> 20: . . . .
> 21: =1 =1 =1 =1
> 22: . . . .
> 23: . . . .
> 24: . . . .
> 25: . . . .
> 26: =2 =2 =2 =2
> 27: . . . .
> 28: . . . .
> 29: . . . .
> 30: . . . .
> 31-133::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor001.krn ^^^ #########################
>
> (eight more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-70::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: . . . .
> 72: . . . .
> 73: . . . .
> 74: . . . .
> 75: 2GG; 2G; 2B; 2g;
> 76: =11 =11 =11 =11
> 77: . . . .
> 78: . . . .
> 79: . . . .
> 80: . . . .
> 81: =12 =12 =12 =12
> 82: . . . .
> 83: . . . .
> 84: . . . .
> 85: . . . .
> 86: =13 =13 =13 =13
> 87: . . . 1e;
> 88: . . . .
> 89: 2EE; 2G#X; 2B; .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> FermataN :: integer
> *Token :: character
>
> Grouping fields: (forty groups)
> Piece :: integer
> Spine :: integerLuckily, we can unfilter(), then filter again by
bar:
chorales |>
unfilter() |>
ungroup() |>
group_by(File, Bar)
> ######################## vvv chor001.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern **kern **kern **kern
> 9: *ICvox *ICvox *ICvox *ICvox
> 10: *Ibass *Itenor *Ialto *Isoprn
> 11: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A *>A
> 15: *clefF4 *clefGv2 *clefG2 *clefG2
> 16: *k[f#] *k[f#] *k[f#] *k[f#]
> 17: *G: *G: *G: *G:
> 18: *M3/4 *M3/4 *M3/4 *M3/4
> 19: *MM100 *MM100 *MM100 *MM100
> 20: 4GG 4B 4d 4g
> 21: =1 =1 =1 =1
> 22: 4G 4B 4d 2g
> 23: 4E 8cL 4e .
> 24: . 8BJ . .
> 25: 4F# 4A 4d 4dd
> 26: =2 =2 =2 =2
> 27: 4G 4G 2d 4.b
> 28: 4D 4F# . .
> 29: . . . 8a
> 30: 4E 4G 4B 4g
> 31-133::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor001.krn ^^^ #########################
>
> (eight more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-70::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: 4D 8F# 4d 4b
> 72: . 4G . .
> 73: 4D . 4c 4a
> 74: . 8F# . .
> 75: 2GG; 2G; 2B; 2g;
> 76: =11 =11 =11 =11
> 77: 2C 2G 2e 2g
> 78: 4AA 4A 4e 4cc
> 79: 4E 4G# 8eL 4b
> 80: . . 8dJ .
> 81: =12 =12 =12 =12
> 82: 4F 4A 4c 4a
> 83: 4C 4G 4c 4e
> 84: 4BB- 4G [2d 4g
> 85: 4AA 4A . 4f
> 86: =13 =13 =13 =13
> 87: 4GG# 4B 4d] 1e;
> 88: 4AA 4A 4c .
> 89: 2EE; 2G#X; 2B; .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> FermataN :: integer
> *Token :: character
>
> Grouping fields: (176 groups)
> Bar :: integer
> File :: integerExample 2
What if you wanted to transpose the bass voice an octave higher, but keep the other voices the same? Well, we could try:
chorales |>
filter(Spine == 1) |>
mutate(Transposed = transpose(Token, by = 'P8')) |>
unfilter()
> ######################## vvv chor001.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern **kern **kern **kern
> 9: *ICvox *ICvox *ICvox *ICvox
> 10: *Ibass *Itenor *Ialto *Isoprn
> 11: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A *>A
> 15: *clefF4 *clefGv2 *clefG2 *clefG2
> 16: *k[f#] *k[f#] *k[f#] *k[f#]
> 17: *G: *G: *G: *G:
> 18: *M3/4 *M3/4 *M3/4 *M3/4
> 19: *MM100 *MM100 *MM100 *MM100
> 20: 4C . . .
> 21: =1 =1 =1 =1
> 22: 4c . . .
> 23: 4A . . .
> 24: . . . .
> 25: 4B . . .
> 26: =2 =2 =2 =2
> 27: 4c . . .
> 28: 4G . . .
> 29: . . . .
> 30: 4A . . .
> 31-133::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor001.krn ^^^ #########################
>
> (eight more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-70::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: 4F . . .
> 72: . . . .
> 73: 4F . . .
> 74: . . . .
> 75: 2BB-; . . .
> 76: =11 =11 =11 =11
> 77: 2E- . . .
> 78: 4C . . .
> 79: 4G . . .
> 80: . . . .
> 81: =12 =12 =12 =12
> 82: 4A- . . .
> 83: 4E- . . .
> 84: 4D- . . .
> 85: 4C . . .
> 86: =13 =13 =13 =13
> 87: 4BB . . .
> 88: 4C . . .
> 89: 2GG; . . .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> FermataN :: integer
> Token :: character
> *Transposed :: character
>
> Grouping fields: (forty groups)
> Piece :: integer
> Spine :: integerWe successfully unfiltered…but the Token field was
unfiltered, not our new Transposed field. This is because
the Tranposed field has no complement data: it didn’t exist
until after the filter was applied. Luckily, we can tell
unfiltered() to use a specific complement, using the
complement argument:
chorales |>
filter(Spine == 1) |>
mutate(Transposed = transpose(Token, by = 'P8')) |>
unfilter(complement = 'Token')
> ######################## vvv chor001.krn vvv #########################
> 1: !!!COM: Bach, Johann Sebastian
> 2: !!!CDT: 1685/02/21/-1750/07/28/
> 3: !!!OTL@@DE: Aus meines Herzens Grunde
> 4: !!!OTL@EN: From the Depths of My Heart
> 5: !!!SCT: BWV 269
> 6: !!!PC#: 1
> 7: !!!AGN: chorale
> 8: **kern **kern **kern **kern
> 9: *ICvox *ICvox *ICvox *ICvox
> 10: *Ibass *Itenor *Ialto *Isoprn
> 11: *I"Bass *I"Tenor *I"Alto *I"Soprano
> 12: *>[A,A,B] *>[A,A,B] *>[A,A,B] *>[A,A,B]
> 13: *>norep[A,B] *>norep[A,B] *>norep[A,B] *>norep[A,B]
> 14: *>A *>A *>A *>A
> 15: *clefF4 *clefGv2 *clefG2 *clefG2
> 16: *k[f#] *k[f#] *k[f#] *k[f#]
> 17: *G: *G: *G: *G:
> 18: *M3/4 *M3/4 *M3/4 *M3/4
> 19: *MM100 *MM100 *MM100 *MM100
> 20: 4C 4B 4d 4g
> 21: =1 =1 =1 =1
> 22: 4c 4B 4d 2g
> 23: 4A 8cL 4e .
> 24: . 8BJ . .
> 25: 4B 4A 4d 4dd
> 26: =2 =2 =2 =2
> 27: 4c 4G 2d 4.b
> 28: 4G 4F# . .
> 29: . . . 8a
> 30: 4A 4G 4B 4g
> 31-133::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> ######################## ^^^ chor001.krn ^^^ #########################
>
> (eight more pieces...)
>
> ######################## vvv chor010.krn vvv #########################
> 1-70::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> 71: 4F 8F# 4d 4b
> 72: . 4G . .
> 73: 4F . 4c 4a
> 74: . 8F# . .
> 75: 2BB-; 2G; 2B; 2g;
> 76: =11 =11 =11 =11
> 77: 2E- 2G 2e 2g
> 78: 4C 4A 4e 4cc
> 79: 4G 4G# 8eL 4b
> 80: . . 8dJ .
> 81: =12 =12 =12 =12
> 82: 4A- 4A 4c 4a
> 83: 4E- 4G 4c 4e
> 84: 4D- 4G [2d 4g
> 85: 4C 4A . 4f
> 86: =13 =13 =13 =13
> 87: 4BB 4B 4d] 1e;
> 88: 4C 4A 4c .
> 89: 2GG; 2G#X; 2B; .
> 90: == == == ==
> 91: *- *- *- *-
> 92: !!!hum2abc: -Q ''
> 93: !!!title: @{PC#}. @{OTL@@DE}
> 94: !!!YOR1: 371 vierstimmige Choralgesänge von Johann Sebastian B***
> 95: !!!YOR2: 4th ed. by Alfred Dörffel (Leipzig: Breitkopf und H&a***
> 96: !!!YOR2: c.1875). 178 pp. Plate "V.A.10". reprint: J.S. Bach, 371 ***
> 97: !!!YOR4: Chorales (New York: Associated Music Publishers, Inc., c.1***
> 98: !!!SMS: B&H, 4th ed, Alfred Dörffel, c.1875, plate V.A.10
> 99: !!!EED: Craig Stuart Sapp
> 100: !!!EEV: 2009/05/22
> ######################## ^^^ chor010.krn ^^^ #########################
> (***four global comments truncated due to screen size***)
>
> humdrumR corpus of ten pieces.
>
> Data fields:
> FermataN :: integer
> Token :: character
> *Transposed :: character
>
> Grouping fields: (forty groups)
> Piece :: integer
> Spine :: integerThus, unfilter() can be used to combine the content of
different fields into one field!