[R] dotplot (lattice) with panel.segments and groups

[Gabor Grothendieck]

It seems to work if you handle the col= argument explicitly.
Suggest you double check this since I have not carefully done so:

barley$yield2 <- with(barley, yield + 5)

dotplot(site ~ yield | variety, data=barley, groups=year,
       yield2=barley$yield2, col=c("gray", "black"),
       panel=function(x, y, subscripts, groups, yield2, col, ...) {
           panel.dotplot(x, y, ...)
           panel.segments(x, as.numeric(y),
              yield2[subscripts], as.numeric(y),
		col = col[groups[subscripts]], ...)
       })



On 7/7/06, Sebastian Luque <spluque at gmail.com> wrote:
> Hi,
>
> The following produces almost exactly what I needed.  The problems are
> that the 'panel.dotplot' call (commented) generates the error 'Error in
> NextMethod("[") : argument "subscripts" is missing, with no default'.  The
> other problem is that the colors alternate between the levels of the 'site'
> variable, rather than 'year'.
>
>
> barley$yield2 <- with(barley, yield + 5)
>
> dotplot(site ~ yield | variety, data=barley, groups=year,
>        yield2=barley$yield2, col=c("gray", "black"),
>        panel=function(x, y, subscripts, yield2, ...) {
>            ## panel.dotplot(x, y, ...)
>            panel.segments(x, as.numeric(y),
>                           yield2[subscripts], as.numeric(y), ...)
>        })
>
> R> sessionInfo()
> Version 2.3.1 (2006-06-01)
> i486-pc-linux-gnu
>
> attached base packages:
> [1] "methods"   "stats"     "graphics"  "grDevices" "utils"     "datasets"
> [7] "base"
>
> other attached packages:
>   chron  gmodels  lattice
>  "2.3-3" "2.12.0" "0.13-8"
>
>
> Can somebody please suggest how to properly make that 'panel.dotplot' call
> and set the 'col' argument?  Thanks in advance.
>
>
> Cheers,
>
> --
> Seb
>
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