# [pstricks] a problem with \psplotDiffEqn

Herbert Voss LaTeX at ZEDAT.FU-Berlin.DE
Thu Mar 15 08:07:04 CET 2007

Andrzej J. Maciejewski schrieb:
> Herbert,
> in fact
> \psplotDiffEqn[arrows=->,ArrowInside=->,arrowscale=2]{0}{8}{4}{\Func}
> gives one arrow in each line joining two points. The problem appear when I
> want to optain a smooth curve and put e.g. plotpoints=100, then my curve
> consists of arrows only.
> If there is no a direct way I will try to find a solution in a different
> way.

Draw the curve twice, one with plotstyle=none.

\documentclass{article}
\begin{document}
%
\def\Func{ neg }
%
\psset{method=rk4,plotpoints=20,linecolor=blue,linewidth=0.5pt}
\begin{pspicture}[showgrid=true](0,-0.5)(8,4)
\psplotDiffEqn[linestyle=none,arrows=->,ArrowInside=->,arrowscale=2]{0}{8}{4}{\Func}
\psplotDiffEqn[plotpoints=100]{0}{8}{4}{\Func}
\end{pspicture}

\end{document}

Herbert