Small change to plot.xy
On Saturday 23 November 2002 04:53 am, Jonathan Rougier wrote:
Does SPSS actually do this, that is arbitrarily assign colours to categories that might be names of colours?
I think you know the answer to that! That wasn't my point. I give statistical computing practicals using the same material to two similar groups of students, some using SPSS and some using R. Right now, the SPSS students are getting a lot more experience of data analysis. My SPSS students put Species in the "colour points by" box. You and I may disagree on what is natural and what is peverse, but my R students want to do "col = iris$Species" and I am sympathetic.
This sort of thing is handled more systematically in Trellis. For example, try library(lattice) data(iris) xyplot(Sepal.Length ~ Sepal.Width, data = iris, groups = Species) splom(iris[, 1:4], groups = iris$Species) (This doesn't exactly answer your original question, but I think it does address the example you have given here.) Deepayan