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+%%
+%% A DANTE-Edition example
+%%
+%% Example 30-04-13 on page 612.
+%%
+%% 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{201.70511pt}
+\setlength\parindent{0pt}
+
+\usepackage{pstricks-add}
+\def\Func{exch RadtoDeg sin -9.81 mul}
+
+\begin{document}
+\psset{yunit=1.5,xunit=2,showpoints}
+\begin{pspicture}[showgrid](0,-1.5)(3,2)
+ \psplotDiffEqn[linecolor=black!40]{0}{3}{1 0}{\Func}
+ \psplotDiffEqn[method=adams,linestyle=dashed]{0}{3}{1 0}{\Func}
+ \psplotDiffEqn[method=rk4]{0}{3}{1 0}{\Func}
+ \rput[rb](2.9,-0.9){Runge-Kutta (rk4)}\rput[rb](1.9,1.3){Euler}
+\end{pspicture}
+\end{document}