MATLAB: Array operation inside summing

arraysum

I would like to make an array "A" from another array called "B" by summing up all previous elements till that element position ….please see below example
A=[1 2 3 4 5] and B array has to as follows
B=[1 1+2 1+2+3 1+2+3+4 1+2+3+4+5]
Please help me out I have quiet a big array to sum up like this.

Best Answer

A=[1 2 3 4 5]  
B=cumsum(A)
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