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Compute difference between rows

Asked by muhammad muda on 25 Feb 2019
Latest activity Commented on by muhammad muda on 25 Feb 2019
I have 4 x 3 matrix and the three columns represent age, height and weight. How do I calculate the magnitude of difference between each row; starting with set (row) 1 and 2, set 1 and 3, and set 1 and set 4. Then, I repeat the same to find the difference between set 2 and 3, and set 2 and set 4, up until set 3 and 4. The difference in this case is defined as summation of max(A(j), B(j)) - min (A(j), B(j)).

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1 Answer

Answer by Jos (10584)
on 25 Feb 2019
 Accepted Answer

I do not understand where A and B come from but this gives the differences between all combinations of 2 rows of the matrix M.
M = randi(100,4,3) % example data
r = nchoosek(1:size(M,1), 2)
D = M(r(:,1),:) - M(r(:,2),:)

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wow, that's impressive! thanks!

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