[pstricks] Graphing function containing a parameter

[Herbert Voss]

Jean-Claude Dehaes wrote:
> I tried the code and it works except if I use the latest version of pstricks-add. Then I get the message
> 
>  
>  Package xkeyval Error: `hatchwidthinc' undefined in families `,pstricks-add'

you need the pstricks.tex _and_ pstricks.pro from
http://perce.de/LateX/pstricks/

then it should work, hopefully ...

Herbert