If its ok to use lattice try this: library(lattice)
# no attach needed # we want VC to be first level, not OJ ToothGrowth$supp <- relevel(ToothGrowth$supp, "VC") # rename levels levels(ToothGrowth$supp) <- c("A", "B") # plot dotplot(len ~ supp | dose, ToothGrowth, layout = c(3, 1)) On Nov 20, 2007 10:04 PM, Judith Flores <[EMAIL PROTECTED]> wrote: > Hi all, > > I I need to manipulate the x axis in a stripchart. > I will use one of the data sets included in R to > explain what I need to do. > > attach(ToothGrowth) > > stripchart(len[supp=='VC']~dose[supp=='VC'], > vertical=TRUE, group.names=c('A','A','A')) > > stripchart(len[supp=='OJ']~dose[supp=='OJ'], add=TRUE, > vertical=TRUE, at=c(1:3)+.1, > group.names=c('B','B','B')) > > As you can read from the code above, I wanted to add > the 'B' to the x axis to diffrenciate each pair of > strips from each other. But only the 'A's appear. > > I tried something like this too, but now '.5','1' and > '2' along with the 'A' and 'B'. > > attach(ToothGrowth) > > stripchart(len[supp=='VC']~dose[supp=='VC'], > vertical=TRUE) > axis(side=1,labels=c('A','B','A','B','A','B'), > at=c(.4,.5,.9,1.1,1.9,2.1)) > > > stripchart(len[supp=='OJ']~dose[supp=='OJ'], add=TRUE, > vertical=TRUE, at=c(1:3)+.1) > > And finally I tried setting par(xaxt='n') before > stripchart, but then I can't add anything to the x > axis. > > Is there a way to manipulate the x axis in a > stripchart like this? > > Thank you very much in advance for your help, > > Judith > > ______________________________________________ > 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.