[pstricks] poisson-distribution

[Herbert Voss]

azzam.hassan at voila.fr schrieb:

> Is there any way to obtain the Poisson distribution

with the pst-func.tex from http://perce.de/LaTeX/pst-func/
It is an undocumented feature, because I do not really
know if the macro works in the right way. Parameters are
N and lambda and all the others are the same as for the
distribution macros (see documentation).

Herbert

\documentclass[a4paper,12pt]{article}
\usepackage{pst-func}
\pagestyle{empty}
\begin{document}

\psset{xunit=1cm,yunit=20cm}%
\begin{pspicture}(-1,-0.05)(14,0.25)%
\uput[-90](14,0){$k$} \uput[90](0,0.2){$P(X=k)$}
\psPoisson[linecolor=red,markZeros,fillstyle=solid,
  fillcolor=blue!10,printValue,valuewidth=20]{13}{6} % {N}{lambda}
\psaxes[Dy=0.1,dy=0.1\psyunit]{->}(0,0)(-1,0)(14,0.2)
\end{pspicture}

\vspace{1cm}
The Possion distribution:

\[ P_\lambda(X=k)=\frac{\lambda^k}{k!}\,e^{-\lambda} \]

\end{document}

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