How to average columns of matrix without loop?

3 views (last 30 days)
Hi! I have a rather big (about 1 000 000 X 10 000) matrix. I want to averaging n column blockes. For example:
n = 3;
A = [1 2 3 4 5 6 7 8 9;10 4 1 2 6 4 1 -4 0];
The result shuold be:
res =
2 5 8
5 4 1
I know it could be done with a for loop using mean, but in my code that would be inside of other for loops, which makes a huge runtime. What I basically need is a mooving averege without overleap, but I couldn't find such matlab function. I wonder, if there is a loop free solution for this.

Accepted Answer

Vladimir Sovkov
Vladimir Sovkov on 6 Jan 2021
reshape(mean(reshape(A',n,[]))',size(A,2)/n,[])'

More Answers (1)

KSSV
KSSV on 6 Jan 2021
There are functions possible to do the said. Read about movemean, blockproc, reshape.

Products


Release

R2019b

Community Treasure Hunt

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

Start Hunting!