Star Liu wrote:
> I'm looking for a free software which can draw 3D picture if I setup
> mathmetical equations and specify its scope, it's an important part of
> my current project. thanks!

You may have a look at octave:

  http://www.gnu.org/software/octave/

For 3D visualisation, you could try octaviz:

  http://octaviz.sourceforge.net/

I used these in the courses at my school, our teacher used and
recommended matlab but I wanted to go with free software. It did a
pretty good job, although it cannot match matlab when it comes to really
extensive 3D plots, animated and all. But you might give it a try.


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