surface interpolating 3d

Hi all,

When you want to draw a surface with a mathematics program you need of two
vectors x and y and a matrix z. Then you plot the surface.
For example:
x=[1 2 3];
y=[5 6 7];
z=[1 2 3
?4 5 6
?7 8 9];

For my applications I have a 3 vectors x, y, z, that are the coordinates x,
y, and z of points in the space. I would find the surface that interpolate
this point. How can I do?
For example:
x=[1 2 3];
y=[5 6 7];
z=[6 9 8];

Thank you very much
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