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Re: calculation in scheme

From: Stefan Thomas
Subject: Re: calculation in scheme
Date: Sat, 17 Sep 2011 18:42:09 +0200

Dear Neil,
thanks for Your proposal.
I've tried Your code, but unfortunately Your code connects always two notes under one slur, no matter which number I've choosen for x.

2011/9/17 Neil Puttock <address@hidden>
On 17 September 2011 14:23, Stefan Thomas
<address@hidden> wrote:
> Dear community,
> I would like to define a variable with sheme and I want to substract the
> number one from this variable.
> I tried it with:
>> % the following defines a Slur, lasting a certain number of eigth-notes
>> xaS = #(define-music-function (parser location x) (number?)
>>   #{ % in der folgenden Zeile Lilypondcode eingeben
>>     s1*0 (  \repeat unfold  #(- $x 1)  {s8 } s8)
>> #})
> Unfortunately without succes!

This doesn't work since the unfold count argument isn't a scheme
number.  I suggest resetting 'repeat-count inside scheme instead:

\version "2.15.11"

xaS =
#(define-music-function (parser location x) (number?)
  (let ((repeat-music #{ \repeat unfold 1 s8 #}))
    (set! (ly:music-property repeat-music 'repeat-count)
          (1- x))
     (list #{ s1*0( #} repeat-music #{ s8) #}))))

\new Voice \relative c' {
 << { c8 d e f } \xaS #4 >>


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