Pedro Fernández Martínez wrote:
> I get the error:
>
>
> ! Undefined control sequence.
> <recently read> \c at lor@to at ps
>
> l.15 \psline[linewidth=1pt,linecolor=gray]{<->}
>
> (0.5,0)(0,1)(1,1.5)(1.5,1)(...
>
> ?
>
> Anything I did wrong? or anything I didn't?
looks like you run pdflatex? Instead of latex.
Herbert