MATLAB: How to perform matrix calculations within the own matrix

matricesmatrixmatrix arraymatrix manipulation

Hi,
I have a 9×612 matrix (A). It consists of 102 variables measured 6 times each (612 columns), in 9 different situations (9 rows). I would like to normalize each repetition to its first one (i.e. A(:,1:6) normalised to A(:,1); A(:,7:12) normalised to A(:,7), etc.
How could I perform these calculations using a for loop?
This is what I have been trying so far without success:
A_normalised = zeros(size(A));
for ii = 1:6:length(A);
    for kk = ii+1:ii+5;
        A_normalised(:,:) = ((A(:,kk).*100)./A(:,ii));
    end
end
However this leads to the error: "Assignment has fewer non-singleton rhs dimensions than non-singleton subscripts"
Please, find attached a matrix example.

Best Answer

A_normalised = zeros(size(A));
for ii = 1:6:length(A)
    for kk = ii:ii+5
        A_normalised(:,kk) = (A(:,kk).*100)./ A(:,ii)-100;
    end
end
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