MATLAB: Conditional sum on particular column of a matrix

conditionsum

Dear all, I am trying to sum first 5 elements of column 1 of matrix m x n one after the other. Eg. say 1 2 3 4 5 6 then I want result as 1 3 6 10 15 21. After than I want to repeat the process again for m rows. Please help me with this. Regards, Suri

Best Answer

You can use cumsum for this:
>> A = bsxfun(@plus,(1:6).',[0,2,5,10])
A =
     1     3     6    11
     2     4     7    12
     3     5     8    13
     4     6     9    14
     5     7    10    15
     6     8    11    16
>> cumsum(A,1)
ans =
     1     3     6    11
     3     7    13    23
     6    12    21    36
    10    18    30    50
    15    25    40    65
    21    33    51    81
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