Array operation inside summing

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.

[Hems]

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!

Answer 1

[Azzi Abdelmalek]

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

[Hems]

thanks!