Interpolation of non-regular matrices

Hello,

I have a problem when interpolating non-regular matrices. I have three non-regular matrices (size 20x20), Z, Y, X and a function where x = f(z,y). What I want is to find the value x depending on value y and z in a non-regular grid.

I have now tried to solve the problem, by using Griddata, which interpolates the matrices to find a matching x to y and z. The problem is that, the error turn out to be big, since the data is non-regular.

Is there a better way to find x?

Thank you for your help.

Kind regards

Matilda

Answer 1

[Shashank Prasanna]

Scattered Interpolation is the way to go:

http://www.mathworks.com/help/matlab/math/interpolating-scattered-data.html

If the results are bad, you may want to try different methods: linear, cubic, natural, nearest etc