Thread Subject: interp2 --> bicubic method mathematics?

Hello,

- THE QUESTION ----------------------
Does anyone know what mathematical formulation is used by the 'cubic' method of interp2; or whether a different function might be more appropriate?
-------------------------------------


- PROBLEM BACKGROUND ----------------
I'm writing code based on a theory manual that I have. For interest, the purpose is to generate quadrilateral panels over the surface of a propeller blade.

I have the surface in a parametric domain, and a grid of data describing x(eta,nu) and y (eta,nu). So, to retrieve the surface I intend to use interp2 with a cubic function.

However, I wish to recreate the data in the theory manual as faithfully as possible. The only guide it gives regarding the interpolation method which should be used is that a hermite spline should be used.

Clearly, in 1D that is no problem. Being no mathematician, however, I was not aware that a hermite method could be used for 2-D interpolation.
-------------------------------------


Thanks for any help!

Best Regards

Tom