Is it possible to embed pstricks, metapost or asymptote markup
in texinfo source?
Only if you also write a pre/postprocessor to do something with it.
Or play some horrible trick with \write18.
Neither of which would be fun.
change the latex preamble for the generated document?
For instance to include \usepackage{pst-plot}.
The standard Texinfo doesn't use LaTeX at all.
On the other hand, maybe what would help is the texi2latex program at
texi2latex.nongnu.org -- it converts Texinfo to LaTeX, and then you can
do LaTeX-y things.
Alternatively can postscript
code be embeded directly in the info source ?
Same answer as above. Texinfo is converted to much more than just
PostScript, so there's no way to use PostScript natively.
Happy graphing,
Karl
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