special sum of an array

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

[Sean de Wolski]

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

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