barchart() {Lattice} help.

Hi Peter,

I'm not sure but it seems "scales" command works only with integer values.

If the y-axis values are very small (such as -0.03, -0.02, -0.01, 0,
0.01,..., 0.08). My current plot has values 0, 0.05, and 0.10 only. But I
need it to extend it to negative numbers and reduce the scale width (like
-0.04, -0.02, 0, 0.02,...).

Can I change these too? Thanks!

Peng

On Thu, Nov 26, 2009 at 3:18 PM, Peter Ehlers <ehlers at ucalgary.ca> wrote:

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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