How to make columns the same size

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My data has two columns (A and B). Column A has a number of rows. Column B has fewer rows than A. How can I make column B have the same number of rows as A ? also, These rows must be filled with the average of the row data in column A.

Accepted Answer

Jos (10584)
Jos (10584) on 21 Feb 2020
A solution:
A = [1 3 ; 2 4 ; 5 7]
B = [10 11 12 ; 13 14 15]
newB = repmat(mean(A,2), 1, size(B,2))
newB(1:size(B,1),:) = B

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