Vectorizing a loop for cumulative sum with reset

6 views (last 30 days)
The lines below work fine to compute cumulative sum on a 1D logical array ('s') such that the summation resets to zero whereever the element in 's' is zero. Question is, how can this be vectorised to avoid loop.
r(1) = s(1); %s is the source vector, r is the result
for i = 2:length(s)
r(i) = (r(i-1) + s(i))*s(i);
end
Thanks.

Answers (1)

Lars Nelson
Lars Nelson on 26 Apr 2023
Unfortunately, because each value in vector r depends on the previous value in r, I do not think that there is a way to vectorize this code and you will have to use a loop.

Categories

Find more on Loops and Conditional Statements in Help Center and File Exchange

Products


Release

R2023a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!