%%
%%  A DANTE-Edition example
%%
%%
%%  Copyright (C) 2011 Herbert Voss
%%
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%%
%%  See http://www.latex-project.org/lppl.txt for details.
%%
%%
%% ====
% Show page(s) 1
%%
\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{225.70511pt}
\setlength\parindent{0pt}

\usepackage{pstricks-add}

\begin{document}
\psset{unit=5}
\begin{pspicture}(-0.04,-0.04)(1,1)
 \psgrid[subgriddiv=5,
   subgridcolor=lightgray]
 \psplotDiffEqn[whichabs=0,
   whichord=1,linecolor=red,
   method=rk4,algebraic,
   plotpoints=400,
   showpoints]%
   {0}{10}{0 0}%
     {cos(Pi*x^2/2)|sin(Pi*x^2/2)}
\end{pspicture}
\end{document}