[pstricks] computed coordinates

Zbigniew Nitecki zbigniew.nitecki at tufts.edu
Sun Mar 28 15:30:26 CEST 2010

I want to draw a series of concentric ellipses with successively larger axes.  The following

				\multido{\rc=0+0.5}{9}{\psellipse[linecolor=green](\rc,\rc\space 2 div)}

yields the error message

! Illegal unit of measure (pt inserted).
<to be read again> 
l.24 ...pse[linecolor=green](\rc,\rc\space 2 div)}

What is missing, since if instead I had written \psellipse(2,1) I would not have gotten this message?

Zbigniew Nitecki
Department of Mathematics
Tufts University
Medford, MA 02155

Office    (617)627-3843
Dept.    (617)627-3234
Dept. fax    (617)627-3966

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