Tena koe Abhi The easiest way is probably
data1$sample <- as.numeric(data1$sample) If you want it to remain as a factor then data1$sample <- as.factor(as.numeric(data1$sample)) HTH .... Peter Alspach > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- > project.org] On Behalf Of Abhishek Pratap > Sent: Thursday, 19 August 2010 5:41 p.m. > To: r-help@r-project.org > Subject: [R] modifying factors in a data frame > > Hi All > > I have a data frame in which on the columns is a factor with following > levels > > Levels: M006 M0114 M0379 M0432 M0823 M1012 M1096 M1107 SW393 SW708 > > I want to change all the M006 to "1", M0114 to "2" and so on. What I > am > trying is not working. > > data1$sample[data1$sample =='M006'] <- "1" > Warning message: > In `[<-.factor`(`*tmp*`, data1$sample == "M006", value = "1") : > invalid factor level, NAs generated > > > Any slick way to do this ? > > Thanks! > -Abhi > > [[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.
