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+%%
+%% Ein Beispiel der DANTE-Edition
+%%
+%% 2. Auflage
+%%
+%% Beispiel 15-03-2 auf Seite 751.
+%%
+%% 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}