Re: duration and pitch in a function

[Jan-Peter Voigt]

Hi Paolo,

this compiles in 2.14.2 on my machine:
--snip--
\version "2.14.2"

myFunction  = #(define-music-function (parser location foobar) (ly:duration?)
  (make-music 'SequentialMusic 'elements (list
    (make-music 'EventChord 'elements (list 
      (make-music 'NoteEvent 'duration foobar 'pitch (ly:make-pitch 1 0 0))
    ))
  ))
)

{
        \myFunction #(ly:make-duration 2 0 1 1) r4
}
--snip--
In your first message you wrote something about one note, that is repeated 3 
times, while augmenting its length - if I did understand your question right. 
I recommend the us of \displayMusic, to see, how notes are constructed in 
scheme. Then you might have one argument (... foobar) (ly:music?), a function 
that copies this note and changes its duration accordingly.

HTH
cheers, Jan-Peter

Am 08.12.2011 um 10:36 schrieb Paolo Prete:

> I searched in "extending" manual for 2.15, but I did not find a solution for 
> my problem.
> 
> Shortly, given this fragment of code:
> 
> ----------------------------------------
> 
> 
> myFunction  = #(define-music-function (parser location foobar) (ly:duration?)
> #{
>   a ...how_can_I_use_$foobar_as_duration_??...
> #})
> 
> \new Staff \myFunction ...how_can_I_pass_duration_??...
> 
> 
> -----------------------------------------
> 
> 
> ...which is the right syntax and which version of lilypond could I use?
> 
> 
> Thanks
> 
> 
> 
> 
> --- Gio 8/12/11, David Kastrup <address@hidden> ha scritto:
> 
>> Da: David Kastrup <address@hidden>
>> Oggetto: Re: duration and pitch in a function
>> A: address@hidden
>> Data: Giovedì 8 dicembre 2011, 07:59
>> Paolo Prete <address@hidden>
>> writes:
>> 
>>> I need to create a function that
>>> 
>>> accepts some_pitch and some_duration as arguments and
>> prints the
>>> following three notes:
>>> 
>>> 1) some_pitch with some_duration
>>> 2) some_pitch with some_duration*2
>>> 3) some_pitch with some_duration*3
>>> 
>>> 
>>> Should I use ly:duration as type of the argument two?
>> 
>> ly:duration? would be the predicate.  And yes,
>> definitely.
>> 
>>> I can't find documentation for that.
>>> 
>>> I use LilyPond 2.12.3 but I can upgrade it if
>> necessary...
>> 
>> If you upgrade, you will find both the functionality itself
>> as well as
>> the documentation.
>> 
>> I don't quite remember the version; it might be necessary
>> to take one of
>> the 2.15.x releases.
>> 
>> -- 
>> David Kastrup
>> 
>> 
>> _______________________________________________
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>> 
> 
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