[R] barchart() {Lattice} help.

[Peter Ehlers]

Peng Cai wrote:
> Hi R Users,
> 
> I'm trying to plot a stacked barplot. Here is data:
> 
> Sample Col1 Col2 Col3
> Row1 -2 4 -1
> Row2 3 -2 4
> Row3 3 5 -2
> Row4 4 1 -1
> 
> I'm using following R code:
> 
> library(lattice)
> dta<-read.table("data.txt", header=TRUE, row.names="Sample")
> barchart(data.matrix(dta),
>         horizontal=FALSE,
>         stack=TRUE,
> col=2:4,
>         auto.key=list(space="right",
> title=names(dimnames(dta))[2])
> )
> 
> Above code is working fine, but I need help with:
> 
> 1) Legend boxes have default colors, whereas I'm looking them to match with
> barplot colors (col=2:4).
replace the line

  col = 2:4,

with

  par.settings = simpleTheme(col = 2:4),

> 2) Can I increase scale for y axis, like currently it plotting -2,0,2,4,...
> I would like it as -2,-1,0,1,...
add the line

  scales = list(y = list(at = -2:8)),

or whatever tick locations you prefer.

  -Peter Ehlers

> 
> Any help would be greatly appreciated,
> 
> Thanks,
> Peng
> 
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> 
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