special sum of an array

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Rica
Rica 2015-6-30
回答： Sean de Wolski 2015-6-30
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!

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Sean de Wolski
Sean de Wolski 2015-6-30
That's a cumulative sum, cumsum is the function you want:
a = [1 2 3]
cumsum(a)
ans =
1 3 6

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