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...;- NA } return (x.del) } The problems is that random.del turns out to be slow on huge samples. Is there any other more effective/charming way to do the same? Thanks, Sergey -- View this message in context: http://r.789695.n4.nabble.com/How-to-erase-replace-certain-elements-in-the-data-frame-tp3470883p3470883.html Sent from the R help mailing list archive at Nabble.com.