Re: Count the number of notes

[Gilles Thibault]

Le 2022-12-20 22:20, | || | | a écrit :
> I need to count the number of notes between to functions. For Example:
>
> \new Staff{
>
>      c4-- \startCount d8-> e8-> f8-> g8-> \stopCount
>
>      #(display how-much-notes-selected)
>
> }
>
> This will be develop for more complex function that will change
> proportionally scale of every notehead in that kind of block, do the
> same as cresc. hairpins  but will act on every notehead instead of
> using spanner.

Sorry to answer so late.
One of the file provided with "arranger.ly" (link below) is called 
addAt.ly, which has been designed for this kind of thing (If I 
understood correctly your request).

%%%%%%%%%%

\version "2.24.0"

\include "addAt.ly"

#(define (events-count mus event) ; event as a symbol or a list of 
symbols
   (length (extract-named-music mus event)))

music = \relative {
  c4 c c c
  \anchor #'A
  d d d <d f>
  \anchor #'B
  e e e e
}

musicAtoB = \musicAt #'A \music  % music between A and the next anchor

#(format #t "Number of notes between A and B : ~a\n"
                (events-count musicAtoB 'NoteEvent))              % 5
#(format #t "Number of chords or notes between A and B : ~a\n"
                (events-count musicAtoB '(EventChord NoteEvent))) % 4

\new Staff { \musicAtoB }

%%%%%%%%%%

You need to download 2 files : addAt.ly and extractMusic.ly (called by 
addAt.ly)

Link for downloading :

    http://gillesth.free.fr/Lilypond/arranger.ly/


Hope that helps.

--
Gilles