Re: \once causes segfault

[Christoph Ludwig]

On Wed, Sep 29, 2004 at 10:06:02AM +0200, Mats Bengtsson wrote:
> I can confirm that the SIGSEGV remains in 2.3.19.
> 
> Just being curious, what did you expect the \once to
> mean in this situation? Should it only apply to the first
> 16th note?

In the score I am transposing I have 

  \time 2/4
  % ...
  | f8 f f16( e) \times 2/3 { e16( d c) } |
  % ...
  r8 f f16 e d c

The group with the triplet should be subdivided for better readability
but the group with the four 16th should not be subdivided.

I am not very familiar with the LilyPond concepts and terminology yet,
I am not a Scheme or Lisp programmer, and I don't completely
understand yet the difference between \override and \set as well as
the scope of these settings. Therefore, I am mostly relying on trial
and error... 

I tried first to set Score.beatLength before the group with the
triplets and reset it to 1/4 in the following measure, but for some
reason it didn't work. Either all beam groups were subdivided or none. 

I then decided to try it with \once because it resets the value after
a time step (or so say the docs). I am not sure about the definition of
"time step" - if it is actually related to beatLength then I can
understand that my attempt confuses lilypond. But I considered it
worth a try - and the result (a core dump) is certainly not what the
developers intended whence I reported it here.

Of course, I'd appreciate any hint how to subdivide a single beam
group only. (We can take it to lilypond-user, I am subscribed there,
too.)

Regards

Christoph

> Christoph Ludwig wrote:
> >Hi,
> >
> >the attached file causes lilypond to dump core:
> >
> >  address@hidden:~/lilypond/music/test> uname -r -m -o
> >  2.4.21-243-default i686 GNU/Linux
> >  address@hidden:~/lilypond/music/test> lilypond -v | head -n 1
> >  GNU LilyPond 2.3.16
> >  address@hidden:~/lilypond/music/test> lilypond beat-length.ly
> >  
> >  Now processing `beat-length.ly'
> >  Parsing...
> >  Interpreting music... Segmentation fault
> >
> >If I comment out the `\once' then everything works fine. However, then all
> >16th groups are subdivided every 8th but I want this only in the first
> >measure. 
> >
> >Is there a known workaround? Or is this already fixed in 2.3.19?
> >
> >Thanks
> >
> >Christoph
> >
> >
> >
> >\version "2.3.16"
> >
> >\score {
> >    \context Staff {
> >        \time 2/4
> >        \relative c'' {
> >            a8 a
> >            \set subdivideBeams = ##t
> >            \once
> >            \set Score.beatLength = #(ly:make-moment 1 8)
> >            a16 a a a
> >            a a a a a a a a
> >        }   
> >    }
> >}
> >
> >
> >
> >_______________________________________________
> >lilypond-devel mailing list
> >address@hidden
> >http://lists.gnu.org/mailman/listinfo/lilypond-devel
> 

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