[pstricks] syntax of !

zbigniew nitecki nitecki2972 at comcast.net
Thu Aug 7 17:52:02 CEST 2008

the following command
				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>
(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

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

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