How to sum columns of a matrix in MATLAB in specified number of columns?

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parham kianian
parham kianian 2020-1-17
评论： parham kianian 2020-1-17
I have a matrix A of size 2500*500. I want to sum each 10 columns and get the result as a matrix B of size 2500*50. that is, the first column of matrix B is the sum of first 10 columns of matrix A, the second column of matrix B is the sum of second 10 columns of matrix A and so on. Since I have too many number of matrices like A and I have to do this operation hundreds of times, it is highly time consuming to do that using for loop.
How can I do this without a for loop?

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Vladimir Sovkov
Vladimir Sovkov 2020-1-17
B=squeeze( sum( reshape(A,size(A,1),10,[]) ,2) );

更多回答（1 个）

KSSV
KSSV 2020-1-17
A = rand(2500,500) ;
B = reshape(A,2500,10,[]) ;
iwant = squeeze(B,2) ;

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