How to normalize a matrix such that each column sums equal 1

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Clarisha Nijman
Clarisha Nijman 2018-10-4
评论： Clarisha Nijman 2018-10-4
Hello,
I have a matrix A=[1 2 3; 1 3 6] and want to normalize the matrix such that each column sum equals 1.
The normalized matrix should be: P=[0.5 0.4 0.33; 0.5 0.6 0.67]
I tried these codes:
P=normc(A);
P=(A)/sum(A,1);
P=A/norm(A,1);
but they do not result in a matrix with column sums 1.
Can somebody give me some feedback?
Thank you in advance,
Clarisha

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采纳的回答

dpb
dpb 2018-10-4
You're missing the "dot" operator so the division is matrix divide not element-wise. See
doc ./
doc rdivide % that's a stretch to know the function name, for sure... :)
A=A./sum(A);
Look up how Matlab operates on arrays in documentation for sum to see why this works for what you want with only one argument...

更多回答（1 个）

Jim Riggs
Jim Riggs 2018-10-4
编辑：Jim Riggs 2018-10-4
[row, col] = size(A);
for i=1:col
P(:,i)= A(:,i)/sum(A(:,i))
end

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