I am trying to add 2 stdev error bars to lattice type plots:
panel.ebar<-function(x,y,dy=NULL,...) {
panel.xyplot(x,y,...)
panel.segments(x,y-dy,x,y+dy,...)
}
Then:
xyplot(y~x|fc,data=dat,dy=dat$dy,panel=panel.ebar)
This adds error bars but they are not conditioned on the factor fc.
xyplot(y+I(y-dy)+I(y+dy)~x|fc,data=dat)
This produces 3 series of points in different colors, conditioned on fc
as the data is now grouped per panel.
Obviously I need a combination of the above two. I can't figure it out.
Any help? Just point to docs if avaiable. The R doc is excellent. Most
of the time I can save myself.
Thanks in advance!
Alex van der Spek
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