[pstricks] multido controlled by postscript variables

[Herbert Voss]

Am 27.01.2018 um 19:58 schrieb Poul Riis:
> Fantastic - it works! I would never ever have found that solution! Can 
> you explain the cause of the problem in a few words? And how your 
> solution works?
> 

\usepackage{xparse}

\ExplSyntaxOn
\DeclareExpandableDocumentCommand\calc{m}{\fp_to_decimal:n{#1}}
\ExplSyntaxOff


this is code from LaTeX3 which can be used with any
up-to-date TeX distribution.

Herbert