However, if you want to do this at all efficiently for a data frame, start with my solution not Uwe's [...]
-- Brian D. Ripley (in a second reply to a question related to data frame manipulations)
R-help (June 2004) #Rstats
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RFortunes (rfortunes)'s status on Saturday, 07-Sep-2019 16:00:02 CEST RFortunes