[R] Code is too slow: mean-centering variables in a data frame by subgroup

Dgnn sharkbrainpdx at gmail.com
Tue Mar 30 18:02:18 CEST 2010


I posted a similar problem last week (but with an uninformative subject
header) See if this 
http://n4.nabble.com/a-vectorized-solution-to-some-simple-dataframe-math-td1692810.html#a1710410
this  helps.

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