# [pstricks] psRandom (PSTricks-add command) and Beamer overlays

Christian Häger christianhaeger at me.com
Wed Sep 19 13:09:16 CEST 2012

Hello,

consider the following minimal example, where the \psRandom command is used to draw random points on a slide, together with an overlay.

\documentclass{beamer}

\begin{document}
\begin{frame}
\begin{pspicture}(5,5)
\psRandom[randomPoints=100](0,0)(5,5){\pscircle(2.5,2.5){2.5}}
\end{pspicture}
\uncover<2>{I am an overlay}
\end{frame}
\end{document}

The effect is that on the second slide, where the overlay appears, the random points are changing. I assume that this is because beamer automatically copies the \psRandom command on each overlay-slide and therefore draws new random points on every slide. Is there a possibility to have the same random points appear on every slide? I don't know how the \psRandom command works but maybe it uses some input seed for a random number generator which could be frozen for the slide?