On 1/11/2008 8:55 AM, Brian Nguyen wrote: > Hi, I've had some trouble figuring out how to produce a histogram in R > directly given a frequency table or relative frequency table. I've looked > through the documentation and mailing list, and have only found information > on producing histograms given the original data set. Any help would be > appreciated! > > An example of what I'd like to do would be to take the following frequency > table: > > Class Freq Rel Freq > ============= > [1,2) 1 1/3 > [2,3) 2 2/3 > > and translate it into the corresponding histogram.
The way hist() works is to create an object of class histogram, and then it plots it. You could create the object directly. For the example above, it would go like this: myhist <- list(breaks = 1:3, counts = 1:2, density = (1:2)/3, xname="X") class(myhist) <- "histogram" plot(myhist) If you know you want a freq=TRUE histogram, you can skip density; if you know you want a freq=FALSE histogram, you can skip counts. You can see in the source to graphics:::plot.histogram that the "equidist" component of the histogram isn't really needed. Duncan Murdoch ______________________________________________ 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.
