I am assuming 'f2' maps to the same grid size as 'f1'. If so, then the size of the interpolated surface of 'f2', lets say 'vq4' will be of the same dimensions as 'vq3'. We can then use logical array operations of MATLAB vectors to get corresponding values of 'v1' if 'v2' is given. Here's some sample code for that:
%Dummy values are used
vq4 = [1, 0, 1; 2, 1, 3; 0, 1, 3]; %f2 mapped to v2
vq3 = [2, 0, 3; 1, 2, 3; 4, 5, 6]; %f1 mapped to v1
v2 = 1;
%The below line will return a vector of logical values on which elements of vq4 = v2
vq4 == v2
We can use this directly to index into 'vq3' to get the corresponding 'v1' values
v1 = vq3(vq4 == v2)
Here's some documentation to help you out:
Hope this is what was expected.
