Interpolating vector data in Matlab

[AndrewSpotlight]

Hi,

Suppose there are three parameters x,y,z, where z is a function of x,y such as z=f(x,y). If I know the value of z at a specific (x,y), for instance f(1,2)=11, f(2,3)=12, f(3,4)=13, f(4,5)=14, is there a way to get z value wrt different (x,y) via interpolation?

(in my case x,y,z are one-column vectors in the same form of n*1)

Thanks!!!

 

[IRstuff]

Why wouldn't there be?

It's only a question of how much complexity you want. In your specific numerical example, everything is on a line in xy space, so linear, bilinear, cubic, bicubic, sinc, spline, etc. are all possible interpolation approaches.

A more general 2-D fit would require a surface of some sort, which might be constructed from splines along diagonals.



TTFN

FAQ731-376
Chinese prisoner wins Nobel Peace Prize

 

[AndrewSpotlight]

Thanks IRstuff!

I finally figured out how to do it =)