%% 
%%  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{201.70511pt}
\setlength\parindent{0pt}
\AtBeginDocument{%
  \psset{mathLabel=false,labelFontSize=\small}}

\usepackage{pst-plot}

\begin{document}
\psset{yunit=0.7}\begin{pspicture}(0,-3.25)(10,3.5)
  \psaxes{->}(0,0)(0,-3)(10,3.5)\psset{algebraic,plotpoints=501}
  \psplot[linecolor=cyan, linewidth=3\pslinewidth]{0.01}{10}{ln(x)}%
  \psplot[linecolor=yellow,linewidth=3\pslinewidth]{0}{10}{3*cos(x)*2.71^(-x/10)}
  \psplot[linecolor=blue,showpoints=true,plotpoints=51]{0}{10}%
    {3*cos(x)*2.71^(-x/10)}
\end{pspicture}
\end{document}