[R] lattice, xyplot, using "panel.segments" by just addressing one panel

[Doris]

Hi R experts, 

I'm using the xyplot function in lattice to draw a multipanel plot consiting
of 5x6 scatterplots.
Now I need to link single points in each of those scatterplots (=panel),but
the points, that need linking are different for each panel.
I tried to use the panel.segments function for that, but I can't address
each panel separately. Links right for panel 1, show up in all other panels,
too. Tried functions like [panel.number()], but didn't work. 

Would be so great, if somebody could help me with that!

That's the code, I used:

library(lattice)
library(latticeExtra)
#[...]
attach(mydata)
attach(links)  #containing the coordinates for the segments fx, fy, tx, ty

fx <- fx
fy <- fy
tx <- tx
ty <- ty

xyplot(LogN~LogM|factor(surber),
par.settings = list(strip.background = list(col = "transparent")),
xlab = "Log M", ylab = "Log N",  
layout = c(6,5), aspect = 1, as.table = TRUE, strip=FALSE,
panel=function(x,y){
panel.xyplot(x,y,pch=20,col="black", bg="transparent")
panel.fill(col = "transparent")
panel.segments(fx,fy,tx,ty[panel.number()])

})


Also tried to split the data and loop it (but this code might be a bit
messy. Apologies!) sn is the variable used to split according to panel. I
just tried to do the links for 2 panel here:

fx <- split(links$fx,links$sn)
fy <- split(links$fy,links$sn)
tx <- split(links$tx,links$sn)
ty <- split(links$ty,links$sn)
sn <- sn
dothese <- c(1,2) 
ct <- 0 
for (i in dothese){
ct <- ct + 1 
x1 <- fx[[i]]
y1 <- fy[[i]]
x2 <- tx[[i]]
y2 <- ty[[i]]
}


xyplot(LogN~LogM|factor(surber),
par.settings = list(strip.background = list(col = "transparent")),
xlab = "Log M", ylab = "Log N",  
layout = c(6,5), aspect = 1, as.table = TRUE, strip=FALSE, 
panel=function(x,y){
panel.xyplot(x,y,pch=20,col="black", bg="transparent")
panel.fill(col = "transparent")
panel.segments (x1,y1,x2,y2 [panel.number(1,2)])

})



Thanks, Doris


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