If you looking for something like x1 <- rnorm(1000, 0.4, 0.8) x2 <- rnorm(1000, 0.0, 1.0) x3 <- rnorm(1000, -1.0, 1.0) hist(x1, width=0.33, offset=0.00, col="blue", xlim=c(-4,4), main="Histogram of x1, x2 & x3", xlab="x1 - blue, x2 - red, x3 - green") hist(x2, width=0.33, offset=0.33, col="red", add=TRUE) hist(x3, width=0.33, offset=0.66, col="green", add=TRUE)
with results as in http://www.maths.lth.se/help/R/plot.histogram/ there is an extension to hist() (actually plot.histogram()) in the R.basic package (part of the R.classes bundle). See http://www.maths.lth.se/help/R/R.classes/ for installation instructions. BTW, you should also consider plotting density() estimates. Henrik Bengtsson > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Sean Davis > Sent: Wednesday, February 02, 2005 2:42 PM > To: r-help > Subject: [R] Combining two histograms > > > I have data like: > > a <- rnorm(20000) > b <- rep(FALSE,20000) > b[sample(1:20000,15000)] <- TRUE > > Using Lattice graphics, I can produce two side-by-side > histograms quite > easily by: > > histogram(a | b) > > However, I would like to produce a "single" histogram with two bars > within each bin, one for each group, as the groups are in > reality very > slightly different from each other. The difference isn't evident > unless one "overlays" the two histograms in some manner. > > Thanks, > Sean > > ______________________________________________ > 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
