Array operation inside summing

2016 7 25
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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.

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Hems
Hems 2016-7-25
编辑：Azzi Abdelmalek 2016-7-25
I found by myself thanks anyways guys...
a=[1 2 3 4 5];
b(1,1)=a(1,1)
for i=2:length (a)
b(1,i)=sum(a(1,1):a(1,i))
end
if you have any other ways please post it as well. Thanks!

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