Message-ID: <200005031309.JAA17184@cattell.psych.upenn.edu>
Date: 2000-05-03T13:09:07Z
From: Jonathan Baron
Subject: :?alternative to loop
for the application of a function to each column of a matrix (ex:
function sum()), i'd like to know if there is a simpler (and faster)
alternative to a loop like :
for (i in 1: ncol(m)){sum(m[i])}
--------
apply(m,2,sum)
will do it. The "2" means "columns". If you want rows, use "1".
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