MATLAB: Save the first non-zero value in each column

Question

Hi all

i have a matrix like that

1	0	1
0	1	0
0	0	0
1	0	1

i want to save only the first non zero values in each column and obtain:

1	0	1
0	1	0
0	0	0
0	0	0

How can i do that?

Thank you for the help

Regards

Answer 1

 (cumsum(matrix) == 1) .* matrix