Your first question seems relatively simple: data.fall<-subset(data,semester=='fall') data.spring<-subset(data,semester=='spring') data.summer<-subset(data,semester=='summer')
plot(x=year,y=value1,data=data.fall) lines(x=year,y=value1,data=data.spring) lines(x=year,y=value1,data=data.summer) As for the second question perhaps the paste command is the way to go datayearsem<-paste(data$year,data$semester,sep='.') On Fri, 2005-02-12 at 06:40 -0600, Jason Miller wrote: > Read R-helpers, > > I'm relatively new to R and trying to jump in feet first. I've been > able to learn a lot from on-line and printed documentation, but > here's one question to which I can't find an answer. Well, it's a > question with a couple parts. Thanks in advance for any direction > (partial or complete) that anyone can provide. > > I have a data frame with three columns: Year, Semester, value1. I > want to treat Year and Semester as factors; there are many years, and > there are three semesters (Fall, Spring, Summer). > > First, I would like to be able to plot the data in this frame as Year > v. value with one curve for each factor. I have been unable to do > this. Is there any built-in R functionality that makes this easy, or > do I need to build this by hand (e.g., using the techniques in FAQ > 5.11 or 5.29)? > > Second, I would like to be able to plot the values against a doubly > labeled axis that uses Year and Semester (three Semester ticks per > Year). Is there a relatively straightforward way to do this? > (What's happening, of course, is that I'd like to treat Year+Semester > as a single factor for the purpose of marking the axis, but I'm not > sure how to do that, either.) > > Again, thanks for whatever pointers people can share. > > Jason > > ================================================================ > Jason E. Miller, Ph.D. > Associate Professor of Mathematics > Truman State University > Kirksville, MO > http://pyrite.truman.edu/~millerj/ > 660.785.7430 > > ______________________________________________ > 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 > ______________________________________________ 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