On 12/2/05, Jason Miller <[EMAIL PROTECTED]> 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.)
Here are some possibilities using the lattice package: library(lattice) d <- data.frame(Year = factor(rep(2000:2004, each = 3)), Semester = gl(3, 1, 15, labels = c("Fall", "Spring", "Summer")), val = sort(rnorm(15))) xyplot(val ~ Year, d, groups = Semester, type = 'o', auto.key = TRUE) xyplot(val ~ Year:Semester, d, scales = list(x = list(rot = 90))) dotplot(Year:Semester ~ val, d) dotplot(Semester ~ val | Year, d, layout = c(1, 5)) HTH, -Deepayan ______________________________________________ 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