Also, it is probably easier to use gl() than coerce your data into a factor
fact <- gl(3, 3, label = c("A", "B", "C")) > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Liaw, Andy > Sent: Tuesday, September 12, 2006 11:32 AM > To: Afshartous, David; r-help@stat.math.ethz.ch > Subject: Re: [R] levels of factor when subsetting the factor > > You have at least two choices: > > R> factor(fact[1:6]) > [1] A A A B B B > Levels: A B > R> fact[1:6, drop=TRUE] > [1] A A A B B B > Levels: A B > > HTH, > Andy > > > From: Afshartous, David > > > > All, > > > > When I take a subset of a factor the reduced factor still maintains > > all the original levels of the factor when say forming the key in a > > plot. > > The data is correct, but the variable still "remembers" the > original > > levels. See below for reproducible code. Does anyone know > how to fix > > this? > > cheers, > > dave > > > > fact = as.factor(c(rep("A", 3),rep("B", 3), rep("C", 3))) > new.fact = > > fact[1:6] > > > new.fact > > [1] A A A B B B > > Levels: A B C ## should only show A B > > > > ______________________________________________ > > 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 > > and provide commented, minimal, self-contained, reproducible code. > > > > > > > -------------------------------------------------------------- > ---------------- > Notice: This e-mail message, together with any > attachments,...{{dropped}} > > ______________________________________________ > 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 > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.