How do I interpolate along a path of scattered points on a MATLAB grid?

Question

I have a NxN grid of values and a 2xM list of x,y data points to be interpolated onto that grid (obtained from the output of countour on a similar grid of values).

How do I do this in MATLAB?

This is sort of the reverse of the problem that griddata, TriScatteredInterp and perhaps more appropriately, inpaint_nan solves (i.e. scattered points to generate a grid).

Answer 1

Use interp2, the tool designed to do exactly that.