shape-preserving interpolation on a surface

Hi all:

My underlying data is a surface. I was wondering if it's possible to use shape-preserving interpolation on the surface. The MATLAB code PCHIP only works on curves.

My purpose is to figure out the partial derivatives of the surface. Because the surface is non-monotonic, I worry that standard surface interpolation techniques could go astray.

Thanks, Jason

Answer 1

[Star Strider]

The documentation for Interpolating Gridded Data and gradient will provide you with functions and examples. The gradient documentation also seems to provide an illustration of what I believe you want to do.

[Jason]

thanks! will try using the gradient function

[Star Strider]

My pleasure!