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From: nico <nicolas.marsgui@libertysurf.fr>
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Subject: Re: calculations
Date: Wed, 20 Sep 2006 00:40:56 +0200
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On Wed, 20 Sep 2006 00:04:33 +0200, Henning Hraban Ramm <hraban@fiee.net>  
wrote:

> Thank you, but now I always get:
>
> ! Illegal unit of measure (pt inserted).
> <to be read again>
>                     .
> \figurewidth ->545.
>                     03625pt
> \dodostartlilypond ...expr (\LPscale \figurewidth
>                                                    ) \ifdim \FigWidth
>  >\localh...

\figurewidth is not a dimension. I guess the following should work:

\def\LPscale{.6315789} % downscale the image
     \ifvmode
        \getfiguredimensions[\bufferprefix  
lilypond-\the\lily!figures.pdf][]%
        \leavevmode%
        \newdimen\FigWidth
        \newdimen\FigWidthReal=\figurewidth
        \FigWidth=\dimexpr(\LPscale\FigWidthReal)
        \ifdim\FigWidth>\localhsize
          \!!dimena=\localhsize
          \advance\!!dimena by-\FigWidth
          \noindent\hskip\!!dimena
        \fi
     \fi
     \externalfigure[\lily!img][scale=\dimexpr(1000\LPscale)]%

Regards,
BG