%%
%% A DANTE-Edition example
%%
%% Example 30-04-15 on page 614.
%%
%% 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{225.70511pt}
\setlength\parindent{0pt}
\usepackage{pstricks-add}
\begin{document}
\psset{unit=0.5cm,plotpoints=500,
method=rk4}
\begin{pspicture}(-6,-4)(5,6)
\psaxes{->}(0,0)(-6,-4)(5,6)
\psplotDiffEqn[linewidth=1.5pt,
whichabs=1,whichord=0,
algebraic]{0}{24}{5 0}%
{y[1]|-y[1]/4-2*y[0]}
\end{pspicture}
\end{document}
