Standardisation about zero mean

5 views (last 30 days)
PARTHA HALDAR
PARTHA HALDAR on 25 Jul 2016
Commented: PARTHA HALDAR on 25 Jul 2016
I have a matrix of order say m*n. Now each column will have some mean. I want to know how can I subtract that mean value from the elements of that particular column so that I can obtain a new standardised matrix of same order?

Answers (2)

Andrei Bobrov
Andrei Bobrov on 25 Jul 2016
a = randi(20,8,6);
out = bsxfun(@minus,a,mean(a));

Vaclav Rimal
Vaclav Rimal on 25 Jul 2016
Given that your original matrix is Aorig, do the following:
Anew = Aorig - ones(size(Aorig,1),1)*mean(Aorig);
Note that you need the multiplication by vector of ones to obtain the correct size of the subtracted matrix. You could also use repmat but it is not that fast.

Community Treasure Hunt

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

Start Hunting!