To learn more about panel functions see the help page for xyplot and especially
the panel argument.
You can get what you want by
contourplot(z~x*y,data=grid,region=T,
col.regions=gray(seq(1,0,len=255)),
colorkey=T,cuts=50,contour=F,
panel = function(x,y,z,...){
panel.contourplot(x,y,z,...)
llines(x=c(-5,5),y=c(-5,5),lwd=5,col="blue")
})
or
contourplot(z~x*y,data=grid,region=T,
col.regions=gray(seq(1,0,len=255)),
colorkey=T,cuts=50,contour=F,
panel = function(x,y,z,...){
panel.contourplot(x,y,z,...)
panel.abline(0,1,lwd=5,col="blue")
})
Med venlig hilsen / Regards
Frede Aakmann Tøgersen
Forsker / Scientist
AARHUS UNIVERSITET / UNIVERSITY OF AARHUS
Det Jordbrugsvidenskabelige Fakultet / Faculty of Agricultural Sciences
Inst. for Genetik og Bioteknologi / Dept. of Genetics and Biotechnology
Blichers Allé 20, P.O. BOX 50
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Fra: [EMAIL PROTECTED] på vegne af Richard D. Morey
Sendt: fr 07-09-2007 03:28
Til: r-help@stat.math.ethz.ch
Emne: [R] contourplot lines, text, and mtext
If I have a contourplot (in the lattice package) and I want to add
straight lines to it, how do I do this?
I see that there are llines() and lsegement() functions for lattice
plots, but they don't seem to do anything in this case:
library(lattice)
library(KernSmooth)
x=rnorm(1)
y=x+rnorm(x,0,.5)
a=bkde2D(cbind(x,y),.7)
z=as.vector(a$fhat)
grid=expand.grid(x=a$x1,y=a$x2)
grid$z=z
contourplot(z~x*y,data=grid,region=T,col.regions=gray(seq(1,0,len=255)),colorkey=T,cuts=50,contour=F)
llines(x=c(-5,5),y=c(-5,5))
> NULL
lsegments(x0=-5,y0=-5,x1=5,y1=5)
I'm just trying to do the equivalent of abline(0,1) on the plot.
ltext(), on the other hand, seems to like to place text in the upper
left corner of the plot. I suspect that I misunderstand the coordinate
system that lattice uses for contour plots. Can anyone enlighten me?
Richard
--
Richard D. Morey, M.A.
Research Assistant, Perception and Cognition Lab
University of M
issouri-Columbia
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and provide commented, minimal, self-contained, reproducible code.
