4D interpolation

[Ben Abbott]

On Jul 3, 2008, at 11:31 AM, Eric S Fraga <e.fraga at ucl.ac.uk> wrote:

> I've been following the brief thread on interpolation with interest.
> Very helpful.
>
> However, I have a problem in which I need to interpolate (2d only)
> onto a surface that is not square.  Given interp2:
>
>     ZI = interp2 (X, Y, Z, XI, YI)
>
> I wish to interpolate (or maybe, if need be, approximate) Z to get ZI
> where XI and YI are not the same size.  And neither are the original X
> and Y for that matter.  interp2 does not allow this.  Can anybody
> please suggest an alternative?
>

By not the same size I assume you are implying X & Y are vectors, and  
Z is a 2D array?

If so check out meshgrid or ndgrid.

Ben