[texhax] can anyone explain this error in pstricks?

[Zbigniew Nitecki]

The set of commands below, when run on its own (in a test file using  
the correct packages and article style, TeX and Ghostscript in  
TeXShop), runs fine;  when inserted in a (much) larger file (also  
with all the right packages), following a theorem (lemma) environment  
and preceding a proof environment, it returns a set of warnings as  
follows:
**************************************************
! Missing number, treated as zero.
<to be read again>
                    P
l.380 					}

?
! Illegal unit of measure (pt inserted).
<to be read again>
                    P
l.380 					}

?
! Missing number, treated as zero.
<to be read again>
                    \relax
l.380 					}

?
! Illegal unit of measure (pt inserted).
<to be read again>
                    \relax
l.380 					}

?
*****************************************************
but then runs fine.  What is going on?

Here is the set of commands in question:
*******************************************************

	\begin{figure}[htbp]
		\begin{center}
			\begin{pspicture}(-0.5,-2.5)(5.5,2.5)
				\psset{xunit=0.25 cm, yunit=1.5 cm}
				\uput[ur](0.75,0.5){$y=\fof{x}$}
				\uput[dr](0.75,-0.5){\textcolor{darkgray}{$y=-\fof{x}$}}
				\psline{<->}(-1,0)(22,0)
				\psline{<->}(0,-1.2)(0,1.2)
				\pscustom%
					{
					\gsave
						\psline[linestyle=none](PI 2 div 0)(0,0)(0,1)
						\psplot[linestyle=none]{0}{PI 2 div}{x COS x  1 add div}%
						\fill[fillstyle=solid, fillcolor=lightgray]
					\grestore
					}
				
				\pscustom[fillstyle=solid, fillcolor=lightgray]%
					{
					\psplot[linestyle=none]{PI 3 mul 2 div}{PI 2 div}{x COS x  1 add  
div}%
					}

				\pscustom[fillstyle=solid, fillcolor=lightgray]%
					{
					\psplot[linestyle=none]{PI 3 mul 2 div}{PI 5 mul 2 div}{x COS x   
1 add div}%
					}

				\pscustom[fillstyle=solid, fillcolor=lightgray]%
					{
					\psplot[linestyle=none]{PI 5 mul 2 div}{PI 7 mul 2 div}{x COS x   
1 add div}%
					}

				\pscustom[fillstyle=solid, fillcolor=lightgray]%
					{
					\psplot[linestyle=none]{PI 7 mul 2 div}{PI 9 mul 2 div}{x COS x   
1 add div}%
					}

				\pscustom[fillstyle=solid, fillcolor=lightgray]%
					{
					\psplot[linestyle=none]{PI 9 mul 2 div}{PI 11 mul 2 div}{x COS  
x  1 add div}%
					}

				\pscustom[fillstyle=solid, fillcolor=lightgray]%
					{
					\psplot[linestyle=none]{PI 11 mul 2 div}{PI 13 mul 2 div}{x COS  
x  1 add div}%
					}

				\psplot[linewidth=1.2 pt]{0}{22}{x COS x  1 add div}
				\psplot[linecolor=darkgray]{0}{22}{x COS x  1 add div -1 mul}


			\end{pspicture}
		\caption{\protect\refer{lem}{absconvint} (Absolute Convergence for  
Integrals)}
		\label{fig:absconvint}
		\end{center}
	\end{figure}
	
************************************************************************ 
************************

Zbigniew Nitecki
Department of Mathematics
Tufts University
Medford, MA 02155

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


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