Summing a Matrix, row by row.

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.

Answer 1

[Andrei Bobrov]

A = [1,2,3;1,2,3;1,2,3]

B = cumsum(A)

Answer 2

[ES]

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