Re: Scheme Problem

[Mats Bengtsson]

The reason that
#{
...
\repeat unfold $beats { r4 }
...
#}

doesn't work is the same that the following doesn't work in an
ordinary .ly file:

numberOfRepeats = 3

...
\repeat unfold \numberOfRepeats {...}
...


In other words, the argument of \repeat cannot be specified
using a variable in the current implementation of LilyPond.


  /Mats



ian_hulin wrote:

> Hi Brett,
> Just a thought - the normal syntax for \repeat is 
>
> \repeat unfold 9 { <music statements> }
>
> in your declaration you've put the keyword in quotes.  Does it help if you
> remove them? E.g. 
>
> --------------------------------------------
> compFor = #(define-music-function (parser location beats) (number?)
>        #{
>            \override Rest #'stencil = 
> #ly:percent-repeat-item-interface::beat-slash
>            \override Rest #'thickness = #'0.48
>            \override Rest #'slope = #'1.7
>           
>            \repeat unfold $beats { r4 }
>           
>            \revert Rest #'stencil
>        #})
> --------------------------------------------
> I don't know any of the Lilypond or Scheme internals but there's a chance
> that this could be confusing a parser or lexical analyzer somewhere along
> the line.  Software diagnostic messages are sometimes just an opener for
> negotiation...
>
> Cheers,
> Ian
>
>
> Brett Duncan-2 wrote:
>  
>
> > The following function is an attempt on my part to learn how to create 
> > such functions, based on what appears in the User Manual. The function 
> > itself is not really important, just a problem I set for myself. It's 
> > supposed to take a number as its argument and produce the equivalent 
> > number of slashes, the idea being to use the slash as a comping symbol, 
> > and substituting the slash for the normal appearance of a quarter rest.
> >
> > --------------------------------------------
> > compFor = #(define-music-function (parser location beats) (number?)
> >        #{
> >            \override Rest #'stencil = 
> > #ly:percent-repeat-item-interface::beat-slash
> >            \override Rest #'thickness = #'0.48
> >            \override Rest #'slope = #'1.7
> >           
> >            \repeat "unfold" $beats { r4 }
> >           
> >            \revert Rest #'stencil
> >        #})
> > --------------------------------------------
> >
> > But when I put
> >
> >    \compFor #16
> >
> > into my .ly file, the following error occurs:
> >
> > syntax error, unexpected NUMBER_IDENTIFIER, expecting DIGIT or UNSIGNED
> >            \repeat "unfold"
> >                                         \lilyvartmpb { r4 }
> >
> >
> > Can someone point out to me where I'm going wrong?
> >
> > Thanks,
> >
> > Brett
> >
> > --
> > Brett Duncan
> > address@hidden
> >
> > "Always do right - this will gratify some and astonish the rest."
> >
> > Mark Twain
> >
> >
> > _______________________________________________
> > 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
=============================================