How to create a loop to sum up the elements in a row array one by one?

Hi all, I have created a row array using below code,

for k = 1:500

c(k)=1/N.*(ecg(k).*exp(-1*i*k*(2*pi/N*t(k))));

end

and I would like to sum up the elements in the row array one by one so that I can have something like this:

a=[ 1 1 1 1 1] %example only

for k=1:5

=> a=[1 2 3 4 5 ] %final answer after the for loop

However, I have no idea what to do next. Can someone help me?

Answer 1

[Dave B]

You can use the cumsum function for this:

a=[1 1 1 1 1];
cumsum(a)

ans = 1×5

1 2 3 4 5

If you have a matrix, and you want to take your sums row-wise, just use the second argument (dim) to specify you want rows:

a=[1 2 3;4 5 6]

a = 2×3

1 2 3 4 5 6

cumsum(a)

ans = 2×3

1 2 3 5 7 9

cumsum(a,2)

ans = 2×3

1 3 6 4 9 15