# Adding values from columns 1:i for each column for a new matrix of the same size

7 views (last 30 days)
Anna B on 30 Dec 2019
Edited: Stijn Haenen on 30 Dec 2019
Hi so I have a 442x25 matrix, what I want to do is for example add values of columns 1 and 2 together to create a new column 2, add values of columns 1, 2 and 3 to create a new column 3, add values of columns 1, 2, 3 and 4 to create a new column 4 and so on until column 25 where all the values will be added. If that makes sense to anyone i would really appreciate your help!
Stephen23 on 30 Dec 2019

Andrei Bobrov on 30 Dec 2019
Edited: Andrei Bobrov on 30 Dec 2019
Let A - your array (442 x 25)
out = cumsum(A,2);

Stijn Haenen on 30 Dec 2019
Edited: Stijn Haenen on 30 Dec 2019
Something like this?
matrix=[1 2 3; 1 2 3; 1 2 3; 1 2 3];
for i=1:size(matrix,2)
matrix_new(:,i)=sum(matrix(:,1:i),2);
end

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