On Tuesday 15 March 2005 16:54, Owen Solberg wrote: > Hello, > > I would be very grateful if anyone could help with what seems like a > simple lattice task. I want to use xyplot, where the symbols for the > plotted points are taken from another column in the data frame. So > if the data frame looked like: > > a <- as.data.frame(matrix(data=c(1,1,10,2,2,20,3,3,30), nrow=3, > ncol=3, byrow=TRUE)) a > > V1 V2 V3 > 1 1 1 10 > 2 2 2 20 > 3 3 3 30 > > you would get an xy scatter plot using where "10" (not a dot) is at > coordinate 1,1, "20" is at 2,2, and so on. > > I have made two attempts. The first, below, almost works, but only > takes the first character from the V3 column: > > library(lattice) > xyplot(V1~V2, data=a, pch=as.character(a$V3)) > > I've also tried this example, which is given in an online user guide > for trellis. It uses the built-in "ethanol" data set (which is also > in lattice), and subscripts... but when I try the same code in > lattice, I get an "invalid graphics state" error. > > library(lattice) > xyplot(NOx ~ E | C, data = ethanol, aspect = 1/2, > panel = function(x, y, subscripts) > text(x, y, subscripts, cex = .75) > )
text() will not do anything useful in a lattice panel function, you want to use ltext or panel.text. There's a very similar example in the help page for xyplot. Deepayan ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
