[R] division of col by the sum of the col

S Ellison S.Ellison at LGCGroup.com
Tue Sep 23 18:42:11 CEST 2014

> If I want to divide the column of a matrix by the sum of the column, should I
> loop over the columns or can I use apply family?

Looping's unnecessary.
See ?scale  or ?sweep, with  ?colSums for two non-looping answers; apply() also works if you give it a suitable function argument.


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