Am 22.04.2013 um 10:14 schrieb Hans Hagen <pra...@wxs.nl>:
> On 4/22/2013 8:48 AM, Wolfgang Schuster wrote:
>>
>> Am 22.04.2013 um 01:13 schrieb Jan Heinen <jahei...@gmx.de>:
>>
>>> In a book I produced with ConTeXt last year, I did a lot of calculation to
>>> be able to change the layout dynamicaly.
>>>
>>> With the actual version of ConTeXt I can't compile the book. I have tried a
>>> lot of things today ... without success.
>>> I hope my minimal-example helps you to understand, what I want to do - and
>>> what I am doing wrong:
>>>
>>>
>>> \starttext
>>> \setupexternalfigures[location={local,global,default}]
>>>
>>> \defineexpandable\ColumnA {30mm}
>>> \defineexpandable\ColumnB {40mm}
>>> \defineexpandable\ColumnABi {\dimexpr(\ColumnA + \ColumnB)}
>>> \defineexpandable\ColumnABii {\ctxlua{context(\ColumnA + \ColumnB)}}
>>> \newdimen\ColumnABiii \ColumnABiii = \dimexpr(\ColumnA + \ColumnB)
>>
>> \definemeasure[ColumnA][30mm]
>> \definemeasure[ColumnB][40mm]
>> \definemeasure[ColumnBi][\the\dimexpr(\measure{ColumnA}+\measure{ColumnB})]
>
> FYI: \the\dimexpr... will look ahead till there's something nonexpandable,
> and contrary to what one expects
>
> \dimexpr(...)
>
> will not stop at the ) so, although with measures it normally goes okay,
> personally I always use \relax as terminator; the \relax will be eaten up so
> there is no interference but it guarantees to stop scanning.
AFAIR the etex already mentions it.
> (I've been wondering if we should make measured \the\dimexpr..\relax
> internally which can save dimexpr at the user end.)
+1
Wolfgang
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