[pstricks] placing subpictures in pstricks

[Zbigniew Nitecki]

I want to place two different pictures side-by-side, and tried the  
following:
**********************************************************************************
> 	\begin{pspicture}(-4,-2.5)(4,2.5)
> 	\psset{xunit=2cm, yunit=2cm}
> 		\newcommand{\polarplane}{
> 			\psline{<->}(0,2)(0,0)(2,0)
> 			\uput[u](0,2){$\theta$}
> 			\uput[r](2,0){$r$}
> 			\pspolygon[fillstyle=hlines,fillcolor=lightgray, gridangle=45]%
> 				(0,0.5)(1.5,0.5)(1.5,1.5)(0,1.5)
> 		}
> 		\newcommand{\rectplane}{
> 			\psline{<->}(0,2)(0,-2)
> 			\psline{<->}(-2,0)(2,0)
> 			\uput[u](0,2){$y$}
> 			\uput[r](2,0){$x$}
> 		\multido{\rr=0.5+0.2}{6}{%
> 			\psarc(0,0){\rr}{0}{90}%
> 			}	
> 		\multido{\rt=0+10}{90}{%
> 			\psline(0.5 \rt\space cos mul, 0.5 \rt\space sin mul)%
> 				(1.5 \rt\space cos mul, 1.5 \rt\space sin mul)%
> 			}	
> 		}
> 		\rput(-4,0){\polarplane}
> 		\rput(2,0){\rectplane}
> 	\end{pspicture}
***************************************************************************************
which gave me an error message

> l.49 		\rput(-4,0){\polarplane}
>
> ?
> ! Illegal unit of measure (pt inserted).
> <to be read again>
>                    0
> l.50 		\rput(2,0){\rectplane}
>
> ?
>

(line 49 is the first \rput)  If I hit return, it repeated the second  
message, four times with 0, then four with 1 in place of zero, etc;   
when I ran in silent mode, I got an output consisting of two copies of  
the object defined by \polarplane, once on the extreme left and the  
other on the extreme right, and no copy of \rectplane.  What is going  
on, and how should I carry out what I want to do?



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/

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