[pstricks] simple (newbie?) pst-plot problem: "! Illegal unit of measure (pt inserted)"

[Goebel, Juergen, OPE26]

> Glen Newton - NRC/CNRC CISTI/ICIST wrote:

> \documentclass[12pt]{article}
> \usepackage{pstcol}
> \usepackage{pst-plot}
> 
> \begin{document}
> \begin{pspicture}(-2.50)(20,250)

This should be something like this:

> \begin{pspicture}(-2,50)(20,250)

pstricks expects two numbers, seperated by a comma.

>   \psset{xunit=2mm,yunit=4mm}
>   \psshadowbox{hello}
> \end{pspicture}
> \end{document}


Regards,

Jürgen