Hi On 2 Dec 2005 at 6:40, Jason Miller wrote:
To: r-help@stat.math.ethz.ch From: Jason Miller <[EMAIL PROTECTED]> Date sent: Fri, 2 Dec 2005 06:40:48 -0600 Subject: [R] plot and factors > 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)? Not sure what do you want to achieve. If x is factor you will get boxplots by plot(factor, data) so maybe stayinng with numeric and labeling with plot(year,data, axes=FALSE) axis(1, ....) can be what you want. > > 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.) Try to look at ?interaction, maybe this can help you. HTH Petr > > 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 Petr Pikal [EMAIL PROTECTED] ______________________________________________ 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