Need help with interpolation

Hello, I am having interpolation like:

xt1=interp2(yt,zt,xt,yt1,zt1,'spline');

Now I want it to change the interpolation to pchip so can anybody help me on how can I use pchip() which will be having same meaning as that of the interp2 used above?

Answer 1

[KSSV]

xt1=interp2(yt,zt,xt,yt1,zt1,'pchip');

Answer 2

[Star Strider]

The 'pchip' method is not available as an option in interp2. The closest you can come is the 'cubic' method, but it imposes conditions.

From the documentation for interp2 and the 'cubic' method:

• Grid must have uniform spacing in each dimension, but the spacing does not have to be the same for all dimensions

If you have unevenly-spaced data, the 'spline' method is your only option.