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+%%
+%% 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{375.57637pt}
+\setlength\parindent{0pt}
+
+\usepackage{pstricks-add}
+\newcommand\InitCond{ 0 0 5 10}
+\newcommand\OMEGA{6.283185}
+\newcommand\h{0.1}
+
+
+\begin{document}
+\psset{unit=2}
+\begin{pspicture}[showgrid](0,-2)(3,1.2)
+ \psset{method=rk4,algebraic=true,whichabs=0,whichord=1}
+ \psplotDiffEqn[linecolor=red,linewidth=1pt,plotpoints=500]
+ {0}{10}{\InitCond}{y[2]|y[3]|\OMEGA*y[3]-\h*(sqrt(y[2]^2+y[3]^2))*y[2]|-\OMEGA*y[2]-\h*(sqrt(y[2]^2+y[3]^2))*y[3]}
+ \psline{->}(0.5,1)
+ \uput[90](0.5,1){$\overrightarrow{v}_0$}
+ \pscircle{0.1}\psdot(0,0)
+ \uput{3mm}[180](0,0){$\overrightarrow{B}$}
+\end{pspicture}
+\end{document}