How to normalize matrix by specific columns matlab?

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Wiktoria Bukowska 2020-1-3

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评论： Wiktoria Bukowska 2020-1-3

Hi everyone,

I have matrix 366x35. I would like to normalize values by specific columns, it means that only columns 1-33 should be normalized and others (34-35) should keep previous values. How I can do that?

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Answer 1

Walter Roberson 2020-1-3

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One kind of normalization:

YourMatrix(:,1:33) = YourMatrix(:,1:33)./sum(YourMatrix(:,1:33));

Another kind:

YourMatrix(:,1:33) = mat2gray(YourMatrix(:,1:33));   %normalizes between min and max of the entire set of columns

Another kind:

min33 = min(YourMatrix(:,1:33));
max33 = max(YourMatrix(:,1:33));
range33 = max33 - min33;
YourMatrix(:,1:33) = (YourMatrix(:,1:33) - min33)./range33;   %normalizes each column to 0 to 1 independently