%% 
%%  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}