Check out example codes for "nearest neaghbor matlab". It will help you in understanding the concepts better.

Code Example 1

Idx = knnsearch([P(1:10,1,1) P(1:10,1,2) P(1:10,1,3)],[P(1,1,1) P(1,1,2) P(1,1,3)],'K',2);

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