[pstricks] computed coordinates

[Zbigniew Nitecki]

Thanks to both you and Herbert for the useful replies.
Maybe someday I'll understand how to compute coordinates.

Zbigniew Nitecki
Department of Mathematics
Tufts University
Medford, MA 02155

telephones:
Office    (617)627-3843
Dept.    (617)627-3234
Dept. fax    (617)627-3966
http://www.tufts.edu/~znitecki/

On Mar 28, 2010, at 12:14, Michael Sharpe wrote:

> 
> On Mar 28, 2010, at 6:30 AM, Zbigniew Nitecki wrote:
> 
>> I want to draw a series of concentric ellipses with successively larger axes.  The following
>> 
>> 			\begin{pspicture}(-3,-2.5)(3,3)
>> 				\multido{\rc=0+0.5}{9}{\psellipse[linecolor=green](\rc,\rc\space 2 div)}
>> 			\end{pspicture}
>> 
>> yields the error message
>> 
>> ! Illegal unit of measure (pt inserted).
>> <to be read again> 
>>                   2
>> 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?
> 
> Either of the following will work.
> 
> \multido{\rc=0+0.5}{9}{\psellipse[linecolor=green](!\rc\space \rc\space 2 div)}
> \multido{\rc=0+0.5,\rd=0+.25}{9}{\psellipse[linecolor=green](\rc,\rd)}
> 
> Michael
> 
> 
> 
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