For huge cases this might be a whiff faster > with(a, Samples[rowSums(a[, -1], na.rm = TRUE) > 0]) [1] S2 S4 Levels: S1 S2 S3 S4 S5
-----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of bill.venab...@csiro.au Sent: Wednesday, 11 August 2010 12:21 PM To: egg...@gmx.net; r-help@r-project.org Subject: [ExternalEmail] Re: [R] TRUE FALSE issue > with(a, Samples[apply(a[,-1], 1, any)]) [1] S2 S4 Levels: S1 S2 S3 S4 S5 -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Alexander Eggel Sent: Wednesday, 11 August 2010 12:05 PM To: r-help@r-project.org Subject: [R] TRUE FALSE issue How can I extract the samples (S1-S5) containing a TRUE value in their row? Solution should apply to a much bigger data frame. > a Samples A B C D . . . 1 S1 FALSE FALSE FALSE FALSE 2 S2 FALSE FALSE NA TRUE 3 S3 FALSE FALSE FALSE FALSE 4 S4 FALSE TRUE FALSE FALSE 5 S5 FALSE FALSE FALSE FALSE . . . Thank you guys, I appreciate your help a lot! [[alternative HTML version deleted]] ______________________________________________ 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. ______________________________________________ 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. ______________________________________________ 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.
