Finding the nearest neighbor to a single point in MATLAB

Question

I\'m trying to do a nearest neighbor search that yields a single point as the single \"nearest neighbor\" to another point in matlab.

I\'ve got the following data:

Answer 1

You should first convert your grid to an n-by-2 matrix (if you created this using meshgrid, it's simply G = [XX(:) YY(:)]), you can then try it with pdist2 if you have the Statistics and Machine Learning Toolbox (which you do):

[D,I] = pdist2(P, G, 'euclidian', 'Smallest', 1);

Where G is the grid and P is your m-by-2 array of points to test.