Re: scheme code generate variable series with leading "\"

[Jan-Peter Voigt]

Hi Ming,

it can be done:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\version "2.19.47"

mel.0 = { <>^\markup{\box\bold"Verse"} g8 8 |}
mel.1 = { c'8. 16~8 b d' c'~8 b~ |}
mel.2 = { b8 a'8~4 r8 g'8 8 8 |}
mel.3 = { f'4. e'8 g' a c'8 16 e'16~ | \break }
mel.4 = { e'8 d'~4~4. g'8 |}
mel.5 = { a'4. g'8 4. e'16 f' |}
mel.6 = { g'8 f'16 g'~8 f' e'4. d'8 |}
mel.7 = { c'4 r16 c'16 a c' a'8 e'16 f'~8 g'~ | \break }

% make a sequence (there's probably a predefined function)
#(define (seq start end)
   (cons start
     (if (< start end) (seq (1+ start) end) '())))

% display string-version
#(display (string-join (map (lambda (i) (format "\\mel.~A" i)) (seq 0 
7)) "\n" 'infix))

{
  \partial 4
  % produce immediate scheme expression
  $(make-music 'SequentialMusic 'elements (map (lambda (i) (assoc-get i 
mel)) (seq 0 7)))
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

You can either produce a string containing the needed lilypond code or 
you create SimultaneousMusic with a list of the resulting var members.

In your example 'mel' turns out to be an assoc-list with the keys 0..7. 
Using map you can produce a list of music expressions.

HTH
Jan-Peter

Am 08.08.2016 um 13:49 schrieb MING TSANG:
> Dear lilyponders:
> I do not know scheme code. Can scheme code to generate variable series
> with leading "\"?
> Detail question in the lily file attachment.
> Thank you for any help.
> Immanuel,
> Ming.
>
>
>
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