Distance between two set of points in space

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andrea
andrea 2022-1-26
评论： David Hill 2022-1-27
Hello,
So I have a set of points in a matrix A 10x3 ( i.e 10 points with x,y,z coordinates) and another set of points in a matrix B 10x3. I want to find the distance between each point of A with each point of B whitout using a for loop.
Normally I would fix a point in A and compute all the distances with the points in B and then choose another point in A and do the same and so on. Is there a way to do it directly from the matrix A and B whitout a loop ?

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回答（2 个）

Matt J
Matt J 2022-1-26
distances = pdist2(A,B);
David Hill
David Hill 2022-1-26
Why no loop? Below is oneliner but has an internal loop.
C=arrayfun(@(x)vecnorm((A(x,:)-B)'),1:size(A,1),'UniformOutput',false);
  2 个评论
andrea
andrea 2022-1-27
Yes thank you for the answer, that's nice. I thought that there could have been a better way without using for loop (some kind of vectorization) because in the case I have lots of points a for loop starts to be very slow.

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