[pstricks] pst-plot-add

[Pedro Jorge Caridade]

Hi Herbert
Sorry to bother you again. I'm using you pst-plot-add to make some
semi-quantitative plots. I'm trying to change your macro PreparePoints
in such a way that the yStart and yEnd could also be introduced. I
thought it would be very easy but the postscript language is killing me.
I think that I need to by a book to understand the programming language.
Can you give me some help?
I add this statements:
\def\psset at yStart#1{\edef\psk at yStart{#1}}
\def\psset at yEnd#1{\edef\psk at yEnd{#1}}

Pedro