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<font face="Myriad Pro">Dear Alexander,<br>
<br>
here my file list:<br>
<br>
*File List*<br>
article.cls 2005/09/16 v1.4f Standard LaTeX document class<br>
size10.clo 2005/09/16 v1.4f Standard LaTeX file (size option)<br>
pstricks-add.sty 2007/09/03 v. 0.11 package wrapper for
pstricks-add.tex (hv<br>
)<br>
pstricks.sty 2008/01/24 v0.37 LaTeX wrapper for `PSTricks' (RN,HV)<br>
pstricks.tex 2008/04/14 v1.22 `PSTricks' (tvz)<br>
xcolor.sty 2007/01/21 v2.11 LaTeX color extensions (UK)<br>
color.cfg 2005/12/29 v1.1 MiKTeX 'color' configuration<br>
dvips.def 1999/02/16 v3.0i Driver-dependant file (DPC,SPQR)<br>
pstricks-add.tex 2008/05/20 v3.03 `PSTricks-add' (hv)<br>
pst-xkey.tex 2005/11/25 v1.6 PSTricks specialization of xkeyval (HA)<br>
xkeyval.sty 2006/11/18 v2.5f package option processing (HA)<br>
xkeyval.tex 2006/11/18 v2.5f key=value parser (HA)<br>
***********<br>
<br>
The following code works proper:<br>
<br>
\listfiles<br>
\documentclass{article}<br>
\usepackage{pstricks-add}<br>
\begin{document}<br>
\psset{unit=8}<br>
\begin{pspicture}(1,1)\psgrid[subgriddiv=5]<br>
\psplotDiffEqn[<br>
whichabs=0,whichord=1,linecolor=red,method=rk4,<br>
plotpoints=500,showpoints=true,algebraic<br>
]{0}{10}{0 0}{<br>
cos(Pi*x^2/2)|sin(Pi*x^2/2)<br>
}<br>
\end{pspicture}<br>
\end{document} <br>
<br>
<br>
Hope this helps.<br>
<br>
Regards,<br>
<br>
Juergen<br>
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