MATLAB: Special sum of an array

Question

hi all, is there any function to do this simply:

Array=[a1 a2 .......an]
i want to calculate this:
ArraySum=[a1  a1+a2  a1+a2+a3 .......a1+a2+a3+...an]

Thank you!

Answer 1

That's a cumulative sum, cumsum is the function you want:

a = [1 2 3]
cumsum(a)
ans =
   1     3     6