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%%
%% A DANTE-Edition example
%%
%% Example 36-00-88 on page 804.
%%
%% 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}
\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}
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