How to remove mean from matrix values?

Hi all. I have M(80x200) matrix. I found mean A=mean(M) for every column so I have A(1x200) matrix. Now I want to subtract means from each values on every columns.

I guess if I turn A matrix into (80x200) then I can M-A

Answer 1

[Geoff Hayes]

jack - you can use a for loop to subtract the mean matrix A from each row of M. Something like

 for k=1:80
    M(k,:) = M(k,:) - A;
 end

Or, you can use repmat to repeat copies of your A to get an 80x100 matrix as

 M = M - repmat(A,80,1);

Try either of the above and see what happens!

[jack star]

Both works fine. Thanks.