# [pstricks] How do you do if then?

Herbert Voss Herbert.Voss at FU-Berlin.DE
Sat Mar 7 07:43:22 CET 2009

David Arnold schrieb:

> This produces a 2 by 4 arrow of boxes. I'd like the first row to have
> four boxes, but the second row to stop at three boxes. This shoud use
> some sort of if then statement, I would imagine, to limit the second
> row to three boxes. How do you use if then in pstricks to get what I
> want?

\documentclass{article}

\def\Box{\psframebox{\rule{3mm}{0pt}\rule{0pt}{3mm}}}
\def\putBox(#1,#2){\rput(#1,#2){\rnode{p#1#2}{\Box}}}

\begin{document}

\begin{pspicture}(1,0.5)(4,2.5)
\multido{\iRow=1+1}{2}{%
\multido{\iCol=1+1}{4}{%
\ifnum\iRow=1        % for lowest row
\ifnum\iCol=4      % and last column do nothing
\else\putBox(\iCol,\iRow)\fi
\else\putBox(\iCol,\iRow)\fi}}
\ncbox[linearc=0.35,nodesep=0.2,linecolor=blue]{p11}{p31}
\ncbox[linearc=0.35,nodesep=0.2,linecolor=blue]{p12}{p32}
\end{pspicture}

\end{document}

Herbert