Re: define own variables

[Mats Bengtsson]

You have hit upon a fine detail in the Scheme programming language.
One solution is to do
Abstand =
 #(define-music-function (parser location wert)
                          (number?)
 #{
    \overrideProperty
    #"Score.NonMusicalPaperColumn"
    #'line-break-system-details
    #`((fixed-alignment-extra-space . ,$wert))
 #})

(note that the quote on the second last line is a back quote). Another 
is to
write it as
Abstand =
 #(define-music-function (parser location wert)
                          (number?)
 #{
    \overrideProperty
    #"Score.NonMusicalPaperColumn"
    #'line-break-system-details
    #(list (cons 'fixed-alignment-extra-space $wert))
 #})

which is less cryptic if you know some basics of LISP/Scheme.

  /Mats

Roland Goretzki wrote:
> Hi,
>
> Using version 2.10.20 I've tried to define an own variable, but it
> doesn't seem to work, although lilypond doesn't give an error or
> warning.
>
> In the attached .ly -file I'm using a variable "manualBeam" taken from
> the documentation, and this does work as expected.
>
> I'm no programmer, so I can't see, why my own variable "Abstand" doesn't
> work.
>
> In the example there ar four outcommented lines, which do the same as
> I'm wanting with my variable "Abstand".
>
> Incommenting these and outcommenting the following line shows, what I
> want to do.
>
> The variale would be better for many calls of
> "\overrideProperty #"Score.NonMusic ..."
> to make the source better readable.
>
> Could somebody help me, please?
>
> Best Regards           Roland
>   
> ------------------------------------------------------------------------
>
> \version "2.10.20"
>
> global = { s1*2 \bar "|." }
>
> manualBeam =
>   #(define-music-function (parser location beg end)
>                            (number? number?)
>   #{ \once \override Beam #'positions = #(cons $beg $end) #})
>
> Abstand =
>   #(define-music-function (parser location wert)
>                            (number?)
>   #{
>      \overrideProperty
>      #"Score.NonMusicalPaperColumn"
>      #'line-break-system-details
>      #'((fixed-alignment-extra-space . $wert))
>   #})
>
> rechts = \context Staff \relative c'{
>   \context Voice = "rechts"
> \manualBeam #3 #6
>   c8 d e f s2
> %\overrideProperty
> %#"Score.NonMusicalPaperColumn"
> %#'line-break-system-details
> %#'((fixed-alignment-extra-space . 7))
>   \Abstand #7
>   \break
> }
>
> links =  \context Staff \relative c{
>   \context Voice = "links"
>   c
> }
>
> \score {
>   \context PianoStaff
>   <<
>     \context Staff = "up" << \global \clef violin \rechts >>
>     \context Staff = "down" << \global \clef bass \links >>
>   >>
> }
>   
> ------------------------------------------------------------------------
>
> _______________________________________________
> lilypond-user mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/lilypond-user
>   

--
=============================================
        Mats Bengtsson
        Signal Processing
        Signals, Sensors and Systems
        Royal Institute of Technology
        SE-100 44  STOCKHOLM
        Sweden
        Phone: (+46) 8 790 8463                         
       Fax:   (+46) 8 790 7260
        Email: address@hidden
        WWW: http://www.s3.kth.se/~mabe
=============================================