Summing a Matrix, row by row.

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Ahsan Khan
Ahsan Khan on 15 Oct 2013
Answered: Andrei Bobrov on 15 Oct 2013
Hello there, I want to get the sum of a matrix row by row. for example if a have a matrix:
A = [1,2,3;1,2,3;1,2,3]
then i want a to generat matrix B in which i will have:
B =[1,2,3;2,4,6;3,6,9]
i have an idea how to achieve this but can't get to work. It can be done by just reading and storing the first row as say A1 of matrix A and then using some sum(A1) and then placing this under a loop for all rows. any help would be appreciated.

Accepted Answer

Andrei Bobrov
Andrei Bobrov on 15 Oct 2013
A = [1,2,3;1,2,3;1,2,3]
B = cumsum(A)

More Answers (1)

ES
ES on 15 Oct 2013
A = [1,2,3;1,2,3;1,2,3;1,2,3]
[m,n]=size(A)
sum=zeros(1,n)
sum_Var=zeros(1,n)
for loop1=1:m
sum_Var=sum_Var+A(loop1,:);
B(loop1,:)=sum_Var;
end

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