How to normalize matrix by specific columns matlab?

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?

Answer 1

[Walter Roberson]

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

[Wiktoria Bukowska]

Thank you!