On 4/22/2013 8:48 AM, Wolfgang Schuster wrote:

Am 22.04.2013 um 01:13 schrieb Jan Heinen :

...

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. (I've been wondering if we should make measured \the\dimexpr..\relax internally which can save dimexpr at the user end.)

...

A \ColumnA% ok

B \ColumnB% ok

% I sadly get only errors when I delete the comments: %ColumnABi: \ColumnABi

A \measure{ColumnA}

B \measure{ColumnB}

C \measure{ColumnBi}

Wolfgang ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

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On 2013-04-22, at 6:43 AM, Wolfgang Schuster wrote:

...

(I've been wondering if we should make measured \the\dimexpr..\relax internally which can save dimexpr at the user end.)

+1

+1 from me as well. Having to use \dimexpr...\relax in definemeasure ISS bit awkward. Aditya