[pstricks] adding noise to a signal

[Herbert Voss]

Doug Mounce wrote:
> Sorry to be dense.  I am interested in this realization, but is one of 
> my packages out of date if I get this error... ?
> 
> \input
>             pst-key
> can't find file .tex

what does

kpsewhich pst-key.tex

say? If nothing, then install this package from CTAN

ftp://ftp.dante.de/tex-archive/graphics/pstricks/generic/pst-key.tex

and put it in any place where TeX finds it and then run texhash.
If you use pstricks-add from http://perce.de/LaTeX/pstricks-add,
then you need pst-xkey, also available from CTAN

ftp://ftp.dante.de/tex-archive/macros/generic/xkeyval

Herbert



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