If I have a 2000 x 130 matrix, how do I convert it to a 500 x 130 matrix by adding all four rows together by using Matlab loop

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Answer 1

[KSSV]

A = rand(2000,130) ;

[r,c] = size(A);
nlay  = r/4;
B   = permute(reshape(A',[c,r/nlay,nlay]),[2,1,3]);
iwant = reshape(sum(B),[],c) ;

[Haytham Ali]

@KSSV thank you

Can you tell me how to sum all 4 elements or rows

Since I want to calculate the average for each of the four elements by calculating their sum divided by their number

[KSSV]

Sum is already included in the code.... To get the average just use mean. Read about this function.