Hello,

I am using xYplot to plot lines with confidence bands (see test

example below). I would like to add a single point with

confidence bars to each graph (coordinates of the points below:

px, py, pxlow, etc...). I tried playing with

panel=panel.superpose, but failed to get it to work. Any ideas on

how to add these points to the graphs?

Thanks for your help,

John

## Test example

x1=seq(1,30,0.5)

y1=x1^2

y2*(x1^2)

ycomb=c(y1,y2)

y.up=ycomb+0.1*ycomb

y.low=ycomb-0.1*ycomb

grp=rep(c("Anls","Plts"),each=length(x1))

dat=as.data.frame(cbind(ycomb, y.up, y.low,

rep(x1,2)),stringsAsFactors=F)

colnames(dat)=c("ycomb","y.up","y.low","x1")

py=c(200,2000); pylow=c(190,1900); pyhi=c(210,2100)

px=c(0,0); pxlow=c(0,0); pxhi=c(0,0)

with(dat,xYplot(Cbind(ycomb, y.up, y.low)~x1|factor(grp),

dataÚt,type="l", method="filled bands", col.fill="light

grey",

scales=list(y=list(relation="free"),x=list(alternating=c(1,1,1))),

ylim=list(c(0,1200),c(0,10000)),

strip=strip.custom(factor.levels=c(expression("Anls

km"^2),expression("Plants km"^2)))))

-------------------------------

John Poulsen

223 Bartram Hall PO Box 118525

University of Florida

Gainesville, FL 32611-8525