[pstricks] syntax of !

[zbigniew nitecki]

the following command
********************************
		\multido{\ry=0.0+0.1}{20}{%
			\psplotThreeD[linecolor=gray,drawStyle=xLines,linewidth=0.2pt]%
				(-0.8,1.25)(!\ry\space\ry\space){%
				0 x 2 exp \ry\space2 exp add 16 div sub%
			}
		}
**********************************
yields the error message
***********************************
Runaway argument?
!\ry \space \ry \space ){0 x 2 exp \ry \space 2 exp add 16 div sub}  
\ifnum \ETC
.
! Paragraph ended before \psplotThreeD at i was complete.
<to be read again>
                    \par
**************************************
(when the three instances of \ry\space are replaced with explicit real  
numbers, everything runs fine).  Do I need to insert the exclamation  
point in the first set of coordinates as well, or am I missing  
something else?

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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