Standardisation about zero mean

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?

Answer 1

[Andrei Bobrov]

a = randi(20,8,6);

out = bsxfun(@minus,a,mean(a));

[PARTHA HALDAR]

Thanks

Answer 2

[Vaclav Rimal]

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.