sum a column per row with loops

let say i have a 10x10 matrix of ones

1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1

how can i sum every column of the matrix, per rows like this

1   =   2   =   3 ...
1       2       3
1       2       3
1       2       3
1       2       3
1       2       3
1       2       3
1       2       3
1       2       3
1       2       3

and so on?

Answer 1

[DGM]

I'm going to assume you mean to do a cumulative sum of rows:

A = ones(5) % a smaller example

A = 5×5

1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

B = cumsum(A,2)

B = 5×5

1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5 1 2 3 4 5