R help - Jul 2011 - color of error bars in Dotplot (Hmisc)

Hello!

In a grouped Dotplot, is there any way to set the color of error bars
to be the same as the corresponding symbols?


Example data:

require(lattice)
require(Hmisc)
data(barley)

Dotplot(variety~Cbind(yield, yield+2, yield-2)|year, groups=site,
data=barley)


I experimented with changing trellis settings of plot.line (as
mentioned in the Hmisc documentation) as well as col.line settings in
"simpleTheme", but that didn't work. Changing the error bars to
any
one other color does work, but I can't seem to figure out how to set
them to the color of each group-specific symbol...

I'd be grateful for any advice,

Irene

Irene Prix wrote:
> 
> 
> In a grouped Dotplot, is there any way to set the color of error bars to
> be the same as the corresponding symbols?
> ...
> require(lattice)
> require(Hmisc)
> data(barley)
> 
> Dotplot(variety~Cbind(yield, yield+2, yield-2)|year, groups=site,
> data=barley)
> 
> 
Customizations of this type can require tricky-digging into the code.
Dotplot calls panel.dotplot, where you find a line

plot.line <- trellis.par.get(if (gp)    "superpose.line"  else
"plot.line")

gp=TRUE when there are groups. So let's give it a try (thanks for the
self-contained example code)

# using global assignment here, better use local
superpose.line = trellis.par.get("superpose.line")
superpose.line
superpose.line$col=c("black","green","red")
superpose.line$lwd=3
trellis.par.set("superpose.line",superpose.line)

Dotplot(variety~Cbind(yield, yield+2, yield-2)|year, groups=site,
data=barley)
----

The good news: the lines are black. The bad news: they are all black, which
is the first term. So it looks like these lines are not vectorized (Frank,
correct me....)

You might be able to get customized results with panel.arrow.

Dieter







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