On 2011-01-19 20:15, Max Kuhn wrote:
Hello everyone,
I'm stumped. I'd like to create a scatterplot matrix with circular
reference lines. Here is an example in 2d:
library(ellipse)
set.seed(1)
dat<- matrix(rnorm(300), ncol = 3)
colnames(dat)<- c("X1", "X2", "X3")
dat<- as.data.frame(dat)
grps<- factor(rep(letters[1:4], 25))
panel.circ<- function(x, y, ...)
{
circ1<- ellipse(diag(rep(1, 2)), t = 1)
panel.xyplot(circ1[,1], circ1[,2],
type = "l",
lty = 2)
circ2<- ellipse(diag(rep(1, 2)), t = 2)
panel.xyplot(circ2[,1], circ2[,2],
type = "l",
lty = 2)
panel.xyplot(x, y)
}
xyplot(X2 ~ X1, data = dat,
panel = panel.circ,
aspect = 1)
I'd like to to the sample with splom, but with groups.
My latest attempt:
panel.circ2<- function(x, y, groups, ...)
{
circ1<- ellipse(diag(rep(1, 2)), t = 1)
panel.xyplot(circ1[,1], circ1[,2],
type = "l",
lty = 2)
circ2<- ellipse(diag(rep(1, 2)), t = 2)
panel.xyplot(circ2[,1], circ2[,2],
type = "l",
lty = 2)
panel.xyplot(x, y, type = "p", groups)
}
splom(~dat,
panel = panel.superpose,
panel.groups = panel.circ2)
produces nothing but warnings:
warnings()
Warning messages:
1: In is.na(x) : is.na() applied to non-(list or vector) of type 'NULL'
It does not appear to me that panel.circ2 is even being called.
Thanks,
Max
I don't see a function panel.groups() in lattice.
Does this do what you want or am I missing the point:
splom(~dat|grps, panel = panel.circ2)
Peter Ehlers
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