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Thank you for your help and your warm welcome.
I will be more attentive to the formatting in the future.

I just tried an example of \psaxes from the »The LaTeX Graphics Companion«, second edition, bottom of page 320:
\documentclass[11pt]{article}
\usepackage{pstricks,pst-plot}

\begin{document}
\begin{pspicture}(-0.5,0.5)(3,-2)
\psaxes[tickstyle=bottom]{->}(3,-2)
\end{pspicture}
\end{document}
The ...