Dear Rich, Thank you for reply. I think, optimization, you offered will satisfy my needs. I don't completely understand the following.
RF> ## And wrap the original in a function for comparison: RF> ## This does not subset the way you want: RF> ## whole[-which(row.names(to.drop) %in% row.names(whole)),] RF> whole[-as.integer(row.names(to.drop)),] Why doesn't my subset work properly? My data frame 'whole' was created from 3 another data frames by rbind, if it makes sense... Moreover, your variant gives the error: > as.integer(row.names(to.drop)[120:220]) [1] 2761 3616 3629 5808 7204 7627 8192 10851 20275 273611 4492 256691 8797 [14] 11756 46673 246981 250401 335591 773 774 786 993 995 1454 2715 6990 [27] 7951 7962 8185 8662 9406 442100 478100 528100 208710 211710 215910 19846 28660 [40] 28661 28691 28806 28878 450611 497411 81672 91572 119232 166191 166281 203981 204201 [53] 255171 255212 255301 300651 331212 371761 397651 405241 415331 8779 195510 197910 203210 [66] 205410 205510 211810 220610 19615 27165 28581 28640 28641 28642 28662 28714 48692 [79] 449611 449911 497211 81702 195451 202491 202551 253931 255071 259102 266971 303341 331831 [92] 353912 371931 374612 394461 397641 412671 9227 464100 1558 2161 > whole[-as.integer(row.names(to.drop)[120:220]),] Error in "[.data.frame"(whole, -as.integer(row.names(to.drop)[120:220]), : subscript out of bounds Row names don't coincide with row order numbers in my case. -- Best regards Wladimir Eremeev mailto:[EMAIL PROTECTED] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html