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Thank you Stefan! sorry my problem was really stupid!

So I cannot use pstricks inside a dvi? there is no way to make a dvi?

Here is a little example:

\documentclass{article}
\usepackage{pst-node}

\begin{document}

$$\begin{psmatrix}[rowsep=1,colsep=1]
& A & [name=upper] B \\
& [name=lower] C & D
\end{psmatrix}
\ncline{->}{lower}{upper} \naput{label}
$$

\end{document}

I expected the label "label" would appear over the ...

Hello everybody.
I am trying to use pstricks, and in particular pst-node.

All commands work, *but* the commands to position labels on the edges:

\ncline{A}{B} \ncput{label}

creates an edge and then puts the label on the node A, instead then on the edge (A,B). :(
The same happens with \naput ...