On 28-10-2011 10:35, Wolfgang Schuster wrote:
Am 28.10.2011 um 08:55 schrieb Thomas A. Schmitz:
Luigi, Patrick,
thanks for your explanations! The point of my question was: can I feed the content of
tex.dimen["textwidth"] directly back to TeX, and the answer to this appears to be "no";
you need to add some unit to it (otherwise, you get an error message). Which was a bit confusing to me at
first, because the name tex.dimen implies that it holds a "real" dimension, like \newdim does.
You can get the same value in TeX when you print the value of a dimension with
\number:
\starttext
\scratchdimen=3pt
\number\scratchdimen
\ctxlua{context(tex.dimen["scratchdimen"])}
\stoptext
which also means that you can say \scratchcounter=\scratchdimen and test
dimens as if they are numbers ... this is why we can have
\let\ifzeropt\ifcase
which probably no one ever noticed in the source.
Hans
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