Adding the values of a vector together and creating a vector comprised of its sums

So I have a column vector s, the length of the vector can change and the values inside are randomly either +1 or -1.

for this question lets say that the vector is 3 values long. N = 3 (where N is the number of values in the vector s)

and say our randomised vector gives us

s = [1; 1; -1; ];

what i would like to do is to add the values in the vector together (from left to right order)

and then create a column vector of the values as they are added. so in this example

1 1+1 2+ -1

therefore the column vector should come out as x = [1; 2; 1; ];

Can someone help me do this? Many thanks.

Answer 1

[Ameer Hamza]

See cumsum().

s = [1; 1; -1; ];
x = cumsum(s)

Result

>> x
x =
     1
     2
     1

[Ben Newton]

Thank you very much

[Ameer Hamza]

I am glad to be of help!