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6.45.5  Cumulated sum of elements of each column of a matrix: cumSum

The cumSum command finds the cumulated sum of each column of a matrix (see also Section 6.40.26).


Example.
Input:

cumSum([[1,2],[3,4],[5,6]])

Output:




12
46
912



since the cumulated sums of the first column are: 1, 1+3=4, 1+3+5=9 and the accumulated sums of the second column are: 2, 2+4=6, 2+4+6=12.


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