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

Herbert Voss Herbert.Voss at FU-Berlin.DE
Wed Sep 19 15:13:58 CEST 2012

Am 19.09.2012 13:09, schrieb Christian Häger:

> 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?

run the example with xelatex and it should be ok

Herbert