>
> > I am really newbie to Sage, but I need to both plot and declare
> > functions like:
> > f(x,y,z) = x*y*z
> > and other poly's containing 3 variables.
> > How do I do that?
>
It sounds like you are looking for a 3-D implicit plot. Is that
correct? Or perhaps a contour plot in 3-D. Unfortunately, although
there are reasonable (though not perfect) 2-D versions of that in
Sage, I do not believe that we have native implicit plotting or
contour plotting available in Sage in 3-D. That would be really nice,
but I don't even pretend to understand how the code might be improved
to implement that.
However, there is the optional experimental package for Surf, which I
believe does plot surfaces (in an algebraic geometry context - their
home page has a nice shot of the 27 lines on a cubic) and can be used
with Sage. The documentation about that on the Sage site does not
inspire confidence that this can effortlessly installed,
unfortunately.
Best,
- kcrisman
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