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...nodup) I have tried using the following, but it is VERY slow: z<-unlist(lapply(1:length(y), function(i) which(a$id==y[i]) )) Returns.filtered<-Returns.nodup[z,] Is there a faster way to do this? -- View this message in context: http://r.789695.n4.nabble.com/Filtering-out-a-data-frame-tp2246814p2246814.html Sent from the R help mailing list archive at Nabble.com.