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)
)
Thank you very much in advance!
Owen Solberg
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version
_ platform i686-redhat-linux-gnu arch i686 os linux-gnu system i686, linux-gnu status major 2 minor 0.0 year 2004 month 10 day 04 language R
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