On 19/02/2008 5:40 PM, Stiffler wrote: > > > Mark Difford wrote: >>>> I was wondering why the plot() command ignores the datatype when >>>> displaying axis labels... >> plot() doesn't ignore the datatype: >> [...] >> plot(x,y) calls xy.coords(), which recasts x as: x = as.double(x), which >> is fine, since x is (also/primarily) numeric. >> >> HTH, Mark. >> >> > > Thanks for the explanation Mark. > > If integers are being recast as doubles R is ignoring/overriding the user's > choice of data-type. There may be good reasons for doing that internally > (uniformity, code re-use etc) , but it is not what I'd expect as an end-user > --- neither ?plot nor ?xy.coords seem to mention that coordinates need to be > floating point numbers.
They don't need to be floating point numbers, they are converted if not. The point is that a scatterplot is a graph of real numbers, not of integers. Use a plot designed for a discrete data type if you don't want things displayed as their real values (see for example barplot, stripchart, dotchart, etc.) 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.
