%% 
%%  Ein Beispiel der DANTE-Edition
%%  
%%  7. Auflage
%% 
%%  Beispiel 29-03-12 auf Seite 648.
%% 
%%  Copyright (C) 2016 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[]{exaarticle}
\pagestyle{empty}
\setlength\textwidth{217.16928pt}
\setlength\parindent{0pt}
%StartShownPreambleCommands
\usepackage{pstricks-add}
%StopShownPreambleCommands
\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=true]%
    {0}{10}{0 0}%
      {cos(Pi*x^2/2)|sin(Pi*x^2/2)}
\end{pspicture}
\end{document}
