Hi Darcy This works for me:
Factor <- rep(factor(letters[1:4]), each = 10) Size <- runif(40) * 100 par(mfrow = c(2, 2)) for (i in unique(Factor)) { hist(Size[Factor == i], main = i, xlab = paste("n =",length(Size[Factor == i])), ylab = "") } I think that using for (i in Factor) cycles through every occurrence of a level and so you only get four plots of the last level rather than a plot for every level. cheers iain --- On Mon, 21/2/11, Darcy Webber <darcy.web...@gmail.com> wrote: > From: Darcy Webber <darcy.web...@gmail.com> > Subject: [R] multiple plots using a loop > To: r-help@r-project.org > Date: Monday, 21 February, 2011, 9:25 > Dear R users, > > I am trying to write myself a loop in order to produce a > set of 20 > length frequency plots each pertaining to a factor level. I > would like > each of these plots to be available on the same figure, so > I have used > par(mfrow = c(4, 5)). However, when I run my loop below, it > produces > 20 plots for each factor level and only displays the last > factor > levels LF plots. I'm fairly new to loops in R, so any help > would be > greatly appreciated. > > I have provided an example data set below if required with > just 4 > factors and adjusted par settings accordingly. > > Factor <- rep(factor(letters[1:4]), each = 10) > Size <- runif(40) * 100 > > par(mfrow = c(2, 2)) > > for (i in Factor) { > LFchart <- hist(Size[Factor == i], main = i, > xlab = c("n =",length(Size[Factor == i])), ylab = "") > } > > P.S. Also just a quick annoying question. My xlab > displays: > n = > 120 > I would like it to display: > n = 120 > but just cant get it to work. Any thoughts. > > Regar > > ______________________________________________ > 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.