[R] Dotplot (package Hmisc) with groups: colours and symbols

[Hugo Mildenberger]

Hello Esther,

you left out the ellipsis argument (...) to the panel function.
That argument serves a placeholder for the rest of the parameters 
you did not want to name and pass explicitely. If you don't pass the
ellipsis to panel.Dotplot, all unnamed parameters will get default 
values. You can see these defaults by typing panel.dotplot or 
edit(panel.dotplot) on the command line.

Dotplot( site~Cbind(yield, yield+5, yield-5)|variety,
             groups = year,
             data   = barley,
	     pch    = c(1,2),
	     panel  = function(x,y,...){
                           panel.Dotplot(x,y,col="black",...);
	})
 
Best 



On Wednesday 11 May 2011 11:11:50 E Hofstadler wrote:
> Hello all,
> 
> This question concerns the function Dotplot from the Hmisc package.
> 
> My aim is to compare values between groups in each panel of the
> Dotplot, with the values of different groups clearly distinguishable
> by different symbols. All lines and symbols should be coloured in
> black.
> 
> Before adding the panel function to the Dotplot, the groups behaved as
> desired and were marked by different symbols, but the error bands were
> blue instead of black. After adding the panel function and changing
> the trellis colour settings, the error bars are now black, but now the
> groups are suddenly marked by the same rather than different symbols.
> I've tried several ways to change the group symbols but to no avail.
> 
> ## set CI lines to black
> t1 = trellis.par.get("plot.line")
> t1$col <- "black"
> trellis.par.set("plot.line",t1)
> 
> ## load example data
> require(lattice)
> data(barley)
> 
> ## example plot (problem: groups marked by the same symbol)
> 
> require(Hmisc)
> Dotplot(site~Cbind(yield, yield+5, yield-5)|variety, groups=year,
> data=barley, pch=c(1,2), col="black",
>         panel=function(x,y){
>             panel.Dotplot(x,y,col="black")})
> Key()
> 
> 
> 
> 
> What am I doing wrong?
> 
> Many thanks in advance.
> Esther
> 
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