Re: calculations

[Hans Hagen <pragma@wxs.nl>]

Peter Rolf wrote:
> Henning Hraban Ramm wrote:
>   
>> Am 2006-09-21 um 21:12 schrieb Peter Rolf:
>>
>>     
>>>>>      \externalfigure[\lily!img][scale=\dimexpr(1000\LPscale)]%
>>>>>           
>>> \numexpr should work here
>>>   ..[scale=\numexpr1000\LPscale\relax]%
>>>       
>> thank you, that seemed what I looked for, but:
>> ! You can't use `\numexpr' in horizontal mode.
>>
>>     
> One of my favourite errors. Everytime it occurs I'm a bit puzzled, as
> I've no general solution for this. I can only tell you what I do in such
> a case.
>
> - check every parameter of the expression
>
> If the expression itself is ok
>
> - check the correct grouping of prior commands (boxes, conditionals,..)
> - try to calculate the expression before you pass it
>   \newcount\Myscale
>   \Myscale\numexpr1000\LPscale\relax
>   ..[scale=\the\Myscale]
>
> But in the end it is more try and error than a systematic action.
> If there is a more general approach to solve this, I would be happy to
> hear it.
>
> Gr
some day soon:

\def\integer#1{\lua{tex.sprint(math.floor(#1))}

scale=\integer{1000*\LPscale}

Hans

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