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.
-- View this message in context: http://n4.nabble.com/Code-is-too-slow-mean-centering-variables-in-a-data-frame-by-subgroup-tp1745335p1745434.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
