overlaying a contour line in a levelplot
On Wednesday 20 April 2005 09:16, Jorge Ahumada wrote:
Hello there, I am creating a series of images using levelplot but I also want to overlay a contour for a particular value as reference. Here is the levelplot command for the image: print(levelplot(d~x+y,data=t,cuts=20,scales=list(draw=F),xlab=NULL,yl ab= NULL,col.regions=heat.colors(100)[100:1]),split=c(1,1,1,1),more=T) and then to add the contour plot (I only want a contour at level 5): print(levelplot(d~x+y,data=t,cuts=20,scales=list(draw=F),xlab=NULL,yl ab= NULL,contour=T,at=c(0,5),reg=F,labels=F),split=c(1,1,1,1)) this shifts the contourline to the right of the levelplot. If I use region=T then it looks better but it is still shifted slighlthy, plus have an extrakey overlayed to the original key with different numbers on it.
You are going about this all wrong. Here's the correct way (with
different data since you haven't given us a reproducible example):
levelplot(volcano,
panel = function(..., at, region = TRUE, contour = FALSE) {
panel.levelplot(..., at = at,
region = region,
contour = contour)
panel.levelplot(..., at = 140,
region = FALSE,
contour = TRUE)
})
Deepayan