Re: Help with music function
Many thanks, Aaron. A clear and helpful answer!
The “why” was simply an exercise in seeing if I could cleanup a LP file by
using such syntactic sugar (to which the answer is no :-) ).
Thanks again
..m.
> On 19 Dec 2023, at 07:05, Aaron Hill wrote:
>
> On 2023-12-17 9:33 pm, Mark Probert wrote:
>> Hi.
>> I'm struggling some with writing a music function for rests. Basically I
>> want to be able to write something like
>> \rel-rest( b', 1)
>
> Minor nit: Functions in LilyPond do not use parentheses and commas for
> arguments in this way. You need only say something like the following to
> invoke your function:
>
>
> \rel-rest b' 1
>
>
>> which would place a dotted quarter rest on the indicated pitch (the
>> equivalent of
>> b'1\rest
>> I'm starting with
>> rel-rest =
>> #(define-music-function (pit dur) (ly:pitch? ly:duration?)
>> #{
>>#pit#dur\rest
>> #})
>> but that gives me an error.
>> Any suggestions?
>
> There are a few things the errors in the output log should be communicating.
>
>> Unbound variable: #{pit\#dur\\rest}#
>
> Firstly, whitespace is important in Scheme. Jamming together #pit#dur\rest
> gives the parser little hope to understand what you mean. It thinks this
> refers to a singular named thing, which in this context does not exist.
>
> So, give each part of that expression some room to breathe:
>
>
> #pit #dur \rest
>
>
> But then LilyPond is not satisfied that this represents a valid music
> expression. When using variables, often the number sign (#) is correct,
> however there are some spots when you need to use the dollar sign ($) instead.
>
>
> $pit $dur \rest
>
>
> Lastly, I am not sure why using the duration "1" as you indicated would
> result in a dotted quarter rest. Did you mean "4." or is the point of the
> music function to manipulate the inputs in some way? I am not sure I see the
> connection/logic there, so you are going to be a bit on your own there.
>
> But with the modification indicated above, you can now do this:
>
>
> { \rel-rest b' 4. }
>
> %% ...or even...
>
> { \rel-rest b'4. }
>
>
> However, this feels like more typing than just using the \rest post-event,
> apart from being prefixed.
>
>
> -- Aaron Hill
Re: Help with music function
Dear Mark,
I did this in a slightly different way...if you do
\displayMusic c4\rest
you can see how to represent a rest using the make-music procedure in
scheme code. Modifying that a bit, I got
%
\version "2.25.6"
%\displayMusic c4\rest =
%(make-music
%'RestEvent
%'duration
%(ly:make-duration 2)
%'pitch
%(ly:make-pitch -1 0))
restt = #(define-music-function (pit dur) (ly:pitch? ly:duration?)
(make-music
'RestEvent
'duration
dur
'pitch
pit)
)
\relative c' {
\restt c 4
\restt e 4
\restt g 4
\restt c 4
\restt b 2
\restt a 2
\restt g 2.
\restt g 4
}
%
-William
On 12/18/23 00:33, Mark Probert wrote:
Hi.
I'm struggling some with writing a music function for rests. Basically
I want to be able to write something like
\rel-rest( b', 1)
which would place a dotted quarter rest on the indicated pitch (the
equivalent of
b'1\rest
I'm starting with
rel-rest =
#(define-music-function (pit dur) (ly:pitch? ly:duration?)
#{
#pit#dur\rest
#})
but that gives me an error.
Any suggestions?
--
--
-mark.
--
William Rehwinkel - Oberlin College and Conservatory '24
will...@williamrehwinkel.net
PGP key: https://ftp.williamrehwinkel.net/pubkey.txt
OpenPGP_signature.asc
Description: OpenPGP digital signature
Re: Help with music function
On 2023-12-17 9:33 pm, Mark Probert wrote:
Hi.
I'm struggling some with writing a music function for rests. Basically
I
want to be able to write something like
\rel-rest( b', 1)
Minor nit: Functions in LilyPond do not use parentheses and commas for
arguments in this way. You need only say something like the following
to invoke your function:
\rel-rest b' 1
which would place a dotted quarter rest on the indicated pitch (the
equivalent of
b'1\rest
I'm starting with
rel-rest =
#(define-music-function (pit dur) (ly:pitch? ly:duration?)
#{
#pit#dur\rest
#})
but that gives me an error.
Any suggestions?
There are a few things the errors in the output log should be
communicating.
Unbound variable: #{pit\#dur\\rest}#
Firstly, whitespace is important in Scheme. Jamming together
#pit#dur\rest gives the parser little hope to understand what you mean.
It thinks this refers to a singular named thing, which in this context
does not exist.
So, give each part of that expression some room to breathe:
#pit #dur \rest
But then LilyPond is not satisfied that this represents a valid music
expression. When using variables, often the number sign (#) is correct,
however there are some spots when you need to use the dollar sign ($)
instead.
$pit $dur \rest
Lastly, I am not sure why using the duration "1" as you indicated would
result in a dotted quarter rest. Did you mean "4." or is the point of
the music function to manipulate the inputs in some way? I am not sure
I see the connection/logic there, so you are going to be a bit on your
own there.
But with the modification indicated above, you can now do this:
{ \rel-rest b' 4. }
%% ...or even...
{ \rel-rest b'4. }
However, this feels like more typing than just using the \rest
post-event, apart from being prefixed.
-- Aaron Hill
Help with music function
Hi.
I'm struggling some with writing a music function for rests. Basically I
want to be able to write something like
\rel-rest( b', 1)
which would place a dotted quarter rest on the indicated pitch (the
equivalent of
b'1\rest
I'm starting with
rel-rest =
#(define-music-function (pit dur) (ly:pitch? ly:duration?)
#{
#pit#dur\rest
#})
but that gives me an error.
Any suggestions?
--
--
-mark.
Re: Help with music-function generating music
Am 26.03.2014 22:53, schrieb Paul Morris:
Hi Urs,
I had a chance to work on the iteration part. This one accepts a note as an
argument which is a better approach, following the examples here:
http://lilypond.org/doc/v2.18/Documentation/extending/doubling-a-note-with-slurs-_0028example_0029
http://lilypond.org/doc/v2.18/Documentation/extending/adding-articulation-to-notes-_0028example_0029
The iteration is done with a named let (which is just one option) see
these docs for Guile and Scheme:
https://www.gnu.org/software/mit-scheme/documentation/mit-scheme-ref/Iteration.html
https://www.gnu.org/software/guile/manual/guile.html#while-do
Cheers,
-Paul
Thank you very much. Such concrete examples are incredibly helpful.
I had already started to fiddle around with yesterday's example and was
trying to achieve something similar to your new example. But I didn't
come to an end (Scheme gives you soo many opportunities to do something
wrong ...), so I can now investigate your example with some pre-knowledge.
I hope (but honestly doubt) to find the time to pour these experiences
in a tutorial (series), as I think that this step is a hard one for many
people, and the respective documentation is really hard to grasp.
Urs
\version 2.18.0
myNotes =
#(define-music-function (parser location note num)
(ly:music? number?)
Returns a series of notes. @var{note} is repeated @var{num} times.
@var{note} is supposed to be a single note.
;; iteration by named let
(let loop
;; two variables/arguments,
;; i is the iteration count
;; nts is the list of notes we're building
((i 0)
(nts '()))
;; conditional
(cond
(( i num)
;; call the loop again with modified values for i and nts
(loop
(+ i 1)
(append nts (list (ly:music-deep-copy note)
(else
;; when done, return the music
(make-music 'SequentialMusic 'elements nts)
{
\myNotes g'16 #8
}
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Re: Help with music-function generating music
Urs Liska u...@openlilylib.org writes:
\version 2.18.0
myNotes =
#(define-music-function (parser location note num)
(ly:music? number?)
Returns a series of notes. @var{note} is repeated @var{num} times.
@var{note} is supposed to be a single note.
;; iteration by named let
(let loop
;; two variables/arguments,
;; i is the iteration count
;; nts is the list of notes we're building
((i 0)
(nts '()))
;; conditional
(cond
(( i num)
;; call the loop again with modified values for i and nts
(loop
(+ i 1)
(append nts (list (ly:music-deep-copy note)
(else
;; when done, return the music
(make-music 'SequentialMusic 'elements nts)
In this case, it is likely easier to replace the named let with
(make-sequential-music
(ly:music-deep-copy
(make-list num note)))
Which is a bit of a dead end for further manipulation which one would
likely do with map or similar on the list returned by
ly:music-deep-copy.
--
David Kastrup
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Re: Help with music-function generating music
David Kastrup wrote In this case, it is likely easier to replace the named let with (make-sequential-music (ly:music-deep-copy (make-list num note))) Which is a bit of a dead end for further manipulation which one would likely do with map or similar on the list returned by ly:music-deep-copy. Thanks! That does look like a better approach. -Paul -- View this message in context: http://lilypond.1069038.n5.nabble.com/Help-with-music-function-generating-music-tp160833p160879.html Sent from the User mailing list archive at Nabble.com. ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Help with music-function generating music
Hi all,
I'm completely at a loss and need to get some help and pushes in the
right direction.
I'm for the first time trying to write a music function that actually
gerenates music events on its own, i.e. that doesn't use #{ #} to output
music.
The sections in the Scheme tutorial in the Extending Manual don't
really help me, and trying to understand
http://lsr.di.unimi.it/LSR/Snippet?id=566 which seems to be quite
related to what I want is equally over my head.
Therefore I'd be happy if someone could give me a (commented?) example
of at least the first steps of what I try. From there I'd be able to go
forward or ask more concrete questions.
The initial thing my function should do is:
- take a pitch and a number
- repeat that pitch for the given number of times
- beam the whole group
- make that in a loop that allows me
to apply a new override for each note
I think that should be very basic, and it's actually quite far from what
I want to achieve, but it should be a good starting point for
understanding how it works.
Thanks in advance
Urs
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Re: Help with music-function generating music
Urs Liska wrote I'm completely at a loss and need to get some help and pushes in the right direction. I would start here with \displayMusic http://lilypond.org/doc/v2.18/Documentation/extending/displaying-music-expressions HTH, -Paul -- View this message in context: http://lilypond.1069038.n5.nabble.com/Help-with-music-function-generating-music-tp160833p160857.html Sent from the User mailing list archive at Nabble.com. ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Re: Help with music-function generating music
Am 26.03.2014 16:08, schrieb Paul Morris: Urs Liska wrote I'm completely at a loss and need to get some help and pushes in the right direction. I would start here with \displayMusic http://lilypond.org/doc/v2.18/Documentation/extending/displaying-music-expressions HTH, not too much, I'm afraid. That's where I actually got stuck already. Fortunately there has been significant progress in the other thread (Exact stem length). But apart from a solution for the problem at hand I'll of course want to learn to deal with this myself... Urs -Paul -- View this message in context: http://lilypond.1069038.n5.nabble.com/Help-with-music-function-generating-music-tp160833p160857.html Sent from the User mailing list archive at Nabble.com. ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user -- Urs Liska +49(0)179-4642905 u...@beautifulscores.net http://beautifulScores.net ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Re: Help with music-function generating music
Ok, here are some next steps. Only dealing with specifying pitch so far.
The number of notes and their duration are both still hard-coded...
-Paul
\version 2.18.0
% use this to see what the end result should look like:
% \displayMusic { c'4 d e f }
% ===
% Here it is:
{
#(make-music
'SequentialMusic
'elements
(list (make-music
'NoteEvent
'duration
(ly:make-duration 2 0 1)
'pitch
(ly:make-pitch 0 0 0))
(make-music
'NoteEvent
'pitch
(ly:make-pitch -1 1 0)
'duration
(ly:make-duration 2 0 1))
(make-music
'NoteEvent
'pitch
(ly:make-pitch -1 2 0)
'duration
(ly:make-duration 2 0 1))
(make-music
'NoteEvent
'pitch
(ly:make-pitch -1 3 0)
'duration
(ly:make-duration 2 0 1
}
% a function that accepts three arguments that are used to determine pitch:
% octave note and alteration:
makeFourQuarterNotes =
#(define-music-function (parser location oct nt alt)
(number? number? number?)
(make-music
'SequentialMusic
'elements
(list (make-music
'NoteEvent
'duration
(ly:make-duration 2 0 1)
'pitch
(ly:make-pitch oct nt alt))
(make-music
'NoteEvent
'pitch
(ly:make-pitch oct nt alt)
'duration
(ly:make-duration 2 0 1))
(make-music
'NoteEvent
'pitch
(ly:make-pitch oct nt alt)
'duration
(ly:make-duration 2 0 1))
(make-music
'NoteEvent
'pitch
(ly:make-pitch oct nt alt)
'duration
(ly:make-duration 2 0 1)
{
\makeFourQuarterNotes #1 #1 #0
\makeFourQuarterNotes #1 #2 #0
\makeFourQuarterNotes #0 #1 #-1/2
\makeFourQuarterNotes #0 #2 #1/2
}
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Re: Help with music-function generating music
Urs Liska wrote
Hi all,
I'm completely at a loss and need to get some help and pushes in the
right direction.
I'm for the first time trying to write a music function that actually
gerenates music events on its own, i.e. that doesn't use #{ #} to output
music.
The sections in the Scheme tutorial in the Extending Manual don't
really help me, and trying to understand
http://lsr.di.unimi.it/LSR/Snippet?id=566 which seems to be quite
related to what I want is equally over my head.
Therefore I'd be happy if someone could give me a (commented?) example
of at least the first steps of what I try. From there I'd be able to go
forward or ask more concrete questions.
The initial thing my function should do is:
- take a pitch and a number
- repeat that pitch for the given number of times
- beam the whole group
- make that in a loop that allows me
to apply a new override for each note
I think that should be very basic, and it's actually quite far from what
I want to achieve, but it should be a good starting point for
understanding how it works.
Thanks in advance
Urs
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Hi,
as Paul Morris pointed out \displayMusic is the best starting point to learn
the scheme way of writing music.
For example \displayMusic { c8[ c c c] } will show you how to beam a group.
Also I don't really get your last point. What kind of override do you want
to apply to the notes?
Regards,
Tao
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Re: Help with music-function generating music
Hi Urs,
I had a chance to work on the iteration part. This one accepts a note as an
argument which is a better approach, following the examples here:
http://lilypond.org/doc/v2.18/Documentation/extending/doubling-a-note-with-slurs-_0028example_0029
http://lilypond.org/doc/v2.18/Documentation/extending/adding-articulation-to-notes-_0028example_0029
The iteration is done with a named let (which is just one option) see
these docs for Guile and Scheme:
https://www.gnu.org/software/mit-scheme/documentation/mit-scheme-ref/Iteration.html
https://www.gnu.org/software/guile/manual/guile.html#while-do
Cheers,
-Paul
\version 2.18.0
myNotes =
#(define-music-function (parser location note num)
(ly:music? number?)
Returns a series of notes. @var{note} is repeated @var{num} times.
@var{note} is supposed to be a single note.
;; iteration by named let
(let loop
;; two variables/arguments,
;; i is the iteration count
;; nts is the list of notes we're building
((i 0)
(nts '()))
;; conditional
(cond
(( i num)
;; call the loop again with modified values for i and nts
(loop
(+ i 1)
(append nts (list (ly:music-deep-copy note)
(else
;; when done, return the music
(make-music 'SequentialMusic 'elements nts)
{
\myNotes g'16 #8
}
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Help debugging music function
Could someone with knowhow help me to debug this music function? I want a
function to create arrows in a Lilypond score:
arrow = #(define-music-function (parser location arg1 ) ( pair?)
#{
\markup { \line \draw-line #arg1 \arrow-head #X #RIGHT ##t }}
#})
When I process:
\version 2.16.0
\include header.ly
\score {
\new Staff {
c4_\arrow #'(10 . 0)
}
}
I get output:
Ontleden...
arrowtest.ly:10:3: fout: music function cannot return (#procedure line-markup
(layout props args) ((#procedure draw-line-markup (layout props dest) (10 .
0)) (#procedure arrow-head-markup (layout props axis dir filled) 0 1 #t)))
c4_
\arrow #'(10 . 0)
Interpreting music...
programmeerfout: Not a music type
Thanks in advance,
Vivian.
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Re: Help debugging music function
2012/11/5 Vivian Barty-Taylor belast...@vivbt.nl:
Could someone with knowhow help me to debug this music function? I want a
function to create arrows in a Lilypond score:
arrow = #(define-music-function (parser location arg1 ) ( pair?)
#{
\markup { \line \draw-line #arg1 \arrow-head #X #RIGHT ##t }}
#})
When I process:
\version 2.16.0
\include header.ly
\score {
\new Staff {
c4_\arrow #'(10 . 0)
}
}
I get output:
Ontleden...
arrowtest.ly:10:3: fout: music function cannot return (#procedure
line-markup (layout props args) ((#procedure draw-line-markup (layout props
dest) (10 . 0)) (#procedure arrow-head-markup (layout props axis dir
filled) 0 1 #t)))
c4_
\arrow #'(10 . 0)
Interpreting music...
programmeerfout: Not a music type
Thanks in advance,
Vivian.
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Hi,
you could try:
\version 2.16.0
arrow = #(define-music-function (parser location arg1) ( pair?)
(make-music
'TextScriptEvent
'text
#{ \markup \line { \draw-line #arg1 \arrow-head #X #RIGHT ##t } #} ))
\new Staff { c4-\arrow #'(10 . 0) }
But see:
http://code.google.com/p/lilypond/issues/detail?id=2949
by David Kastrup
(5 minutes ago)
Cheers,
Harm
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Re: Help debugging music function
Vivian Barty-Taylor belast...@vivbt.nl writes:
Could someone with knowhow help me to debug this music function? I
want a function to create arrows in a Lilypond score:
arrow = #(define-music-function (parser location arg1 ) ( pair?)
#{
\markup { \line \draw-line #arg1 \arrow-head #X #RIGHT ##t }}
#})
A markup is not music, and a music function can only return music.
In version 2.17.6, just using define-scheme-function instead of
define-music-function should have been enough (apart from needing to
match braces better). Turns out that this is not the case, but will be
after issue 2949
URL:http://code.google.com/p/lilypond/issues/detail?id=2949 passes.
The nicest 2.16 approach would likely be using define-event-function
here and writing #{ - \markup ... #} instead of just #{ \markup ... #}.
In that case, you can use \arrow _only_ as a text script and not
otherwise as text/markup.
The traditional approach would rather use define-markup-command
(different overall syntax, however), and would require using
_\markup \arrow ...
for calling this.
--
David Kastrup
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Re: Help, simple music function not compiling
%% the function that will fail
tempoMarkEqual =
#(define-music-function (parser location before after)
(string? string?)
#{
\mark \markup \tiny { \note $before #1 = \note $after #1 }
#} )
with a '#' before $before and $after, it works.
Thanks a lot ! Can somebody explain why the #s were needed in that case ?
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Help, simple music function not compiling
Hi lilypond helpers,
Here is a small program that does not compile:
---
\version 2.12.3
%% the function that will fail
tempoMarkEqual =
#(define-music-function (parser location before after)
(string? string?)
#{
\mark \markup \tiny { \note $before #1 = \note $after #1 }
#} )
%% example begins here
{
\time 2/4
re'2
|
%% this works well
\mark \markup \tiny {\note #8 #1 = \note #8 #1 }
re'2
|
%% this is an attempt to get the same result with a function
\tempoMarkEqual #8 #8
re'2
}
--
The first \mark command works well, but the function fails with:
string:2:30: Error : syntax error, unexpected STRING_IDENTIFIER,
expecting SCM_IDENTIFIER or SCM_TOKEN
\mark \markup \tiny { \note
\lilyvartmpb #1 = \note \lilyvartmpc #1 }
What did I miss ?
Thanks,
Eric
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Re: Help, simple music function not compiling
On 29 January 2011 23:23, Eric Dedieu papa.e...@free.fr wrote:
Hi lilypond helpers,
Here is a small program that does not compile:
---
\version 2.12.3
%% the function that will fail
tempoMarkEqual =
#(define-music-function (parser location before after)
(string? string?)
#{
\mark \markup \tiny { \note $before #1 = \note $after #1 }
#} )
%% example begins here
{
\time 2/4
re'2
|
%% this works well
\mark \markup \tiny {\note #8 #1 = \note #8 #1 }
re'2
|
%% this is an attempt to get the same result with a function
\tempoMarkEqual #8 #8
re'2
}
--
The first \mark command works well, but the function fails with:
string:2:30: Error : syntax error, unexpected STRING_IDENTIFIER,
expecting SCM_IDENTIFIER or SCM_TOKEN
\mark \markup \tiny { \note
\lilyvartmpb #1 = \note \lilyvartmpc #1 }
What did I miss ?
Use
tempoMarkEqual =
#(define-music-function (parser location before after)
(string? string?)
#{
\mark \markup \tiny { \note #$before #1 = \note #$after #1 }
#} )
with a '#' before $before and $after, it works.
Par contre pour les explications je passe la main...
Cordialement,
Xavier
--
Xavier Scheuer x.sche...@gmail.com
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