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How to remove mean from matrix values?

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jack star
jack star 2016-5-14
评论： jack star 2016-5-14
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

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Geoff Hayes
Geoff Hayes 2016-5-14
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!

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