about 3D plotting

[myong]

hello:

    I have function z=f(x,y) in the common x-y-z system. I want to draw 
the image of function in the octave. can I use gsplot method? How do I 
use it?

    I get point vector data[x,y,z], I use "gsplot data" But can't get 
correct image, I think octave have a different coordinate system.

    who can tell me correct method!



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