how to let elements in each column of a matrix divided by the first element in each column

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Chen
Chen on 4 Aug 2018
Edited: dpb on 4 Aug 2018
is there a simple way to let all the elements in a column of a matrix divided by the first element of each column, without using for loop?

Answers (1)

dpb
dpb on 4 Aug 2018
Edited: dpb on 4 Aug 2018
x=x./x(1,:);
uses recent automagic(*) singleton expansion, if you have earlier release that errors on size mismatch then use bsxfun
x=bsxfun(@rdivide,x,x(1,:));
(*) I don't recall just when was introduced around R2015 or so...R2014b is earliest presently installed here --
>> x./x(1,:)
Error using ./
Matrix dimensions must agree.
>>

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