Hi, I have a data-frame, r (column names below), that needs subsetting: date, time, strain, gene, deltact
When I try to subset r by applying selection criteria on two columns I get an empty data frame. For example I would like to extract all rows that have time == 0h and strain == ROC. So, t <- subset(r, (r$time == "0h" && r$strain == "ROC"), select= c(time, strain, gene, deltact)) returns an empty data-frame. Is it not possible to subset based on two criteria? TIA Anjan -- =================================== anjan purkayastha, phd. research associate fas center for systems biology, harvard university 52 oxford street cambridge ma phone-703.740.6939 =================================== [[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.