putting function values in meshgrid format

I have coordinate vectors X and Y and corresponding vector of function values Z. Points (Xi,Yi) are distributed irregularly on plane. I'm trying to convert these points to a regular mesh with constant spacing, calculate corresponding values Z and plot them using surf. What is the best way to do it in matlab? I was looking at interp2, but it requires data in meshgrid format.

Thanks!

Answer 1

[Star Strider]

Your data may already be gridded. I would first plot it using stem3, for example:

figure
stem3(X, Y, Z)
grid on

If it appears that the data are regularly spaced with respect to ‘X’ and ‘Y’, then you only need to use reshape to create matrices from your vectors. If you then want to interpolate it, the griddata function may be easiest to use.

[skuznet]

Thanks! Looks like I'm asking incorrect question. I've corrected it. The data is actually already grided, but the mesh is irregular, I'm trying to put it on a regular mesh, with constant spacing.

[Star Strider]

My pleasure.

You likely need to use reshape to create matrices from your vector data. Then you can use interp2, griddata, or other interpolation options with it.

[skuznet]

Thanks a lot! The following worked for me:

Zinter = scatteredInterpolant(Xs,Ys,Z) %defines interpolant for scattered data and allows to calculate values of z for any point

[Star Strider]

As always, my pleasure!