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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{201.70511pt}
\setlength\parindent{0pt}
\usepackage{pst-plot,pst-func}
\newcommand*\plot[3][linecolor=black]{%
\pstVerb{/lambda #2 def }
\psplot[#1]{0}{#3}{ x Func }%
}
\pstVerb{/Func { % x has to be on top of the stack
lambda mul neg Euler exch exp lambda mul } def }
\begin{document}
\psset{yunit=3cm,xunit=2cm}
\begin{pspicture}(4,2.5)
\psaxes{->}(4,2.5)
\plot[linewidth=1.5pt,linecolor=red]{2}{3.8}
\psline[linestyle=dashed](!0 .5 Func)(!.5 dup Func)(0.5,0)
\rput[lb](! .6 .5 Func){\psPrintValue{0.5 Func}}
\rput(2,2){$f(x)=\lambda\cdot e^{-\lambda x}$}
\end{pspicture}
\end{document}
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