On Nov 15, 2007 8:08 PM, Bob Farmer <[EMAIL PROTECTED]> wrote:
> Hi.
> I've got a lattice plot with multiple panels and two groups superimposed
> on each panel. Each panel has an independently scaled y-axis (scales =
> list(relation = "free")).
>
> I've successfully put up 95%CI error bars using panel.arrows (and some
> help from the mailing list). My question is whether I can "unscale" the
> arrowheads so that they appear to have the same length across all panels.
> I recognize from the help-file that the "length" argument in
> panel.arrows is in terms of grid units (which I assume are specific to
> the particular panel). Can anybody think of a way to set the length so
> that it appears uniform across all panels?
The obvious approach would be to use a relative unit like "cm" or
"inch" instead of an absolute one like "native". Does that not work?
-Deepayan
>
> Example code:
>
> summTable<-data.frame("X" = seq(1,12), "Y" =
> c(1,8,3,6,6,5,7,3,8,1,10,-2),
> "Location" = rep(c("Site1", "Site2"), times = c(6,6)),
> "Species" = rep(c("A", "B"), 6)
> )
>
> #change scale for Site 1
> summTable[1:6,2]<-100*summTable[1:6,2]
>
> #arbitrary confidence intervals
> summTable<-cbind(summTable, "ly" = (summTable$Y*(.98)),
> "uy" = (summTable$Y*1.02)
> )
>
> #panel plotting
> panel.func<-function(x,y,ly,uy,subscripts,...){
> ly<-as.numeric(ly)[subscripts]
> uy<-as.numeric(uy)[subscripts]
> panel.arrows(x,ly,x,uy,
> unit = "native",
> angle = 90,
> length = .25,
> code = 3,
> )
> panel.xyplot(x,y,...)
> }
> xyplot(Y ~ X | Location, groups = Species,
> type = "l",
> data = summTable,
> scales = list(relation = "free"),
> ly = summTable$ly, uy = summTable$uy,
> auto.key = T,
> panel = panel.superpose,
> panel.groups = panel.func
> )
>
> Thank you.
>
> --Bob Farmer
> (using R 2.6.0 and lattice 0.16-5)
>
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