Hi all,
long story short: I want to calculate a width or height from user input,
which is in the form "0.x" (as in "0.3\textwidth") since I want to use
that number differently in different circumstances. Problem is that
\dimexpr doesn't like decimal values. Example (uncomment second
\externalfigure to see the problem):
\starttext
\def\myfactor{0.3}
\externalfigure[mill][height=\myfactor\textwidth]
%\externalfigure[mill][height=\dimexpr10cm*\myfactor\relax]
\stoptext
(silly, but shows my problem). How can I obtain an image of height
"0.3*10cm" from my \myfactor macro? I tried to get my head around
\numexpr etc. in the etex manual, but couldn't really figure out what to do.
Thanks, and all best
Thomas
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