[R] barchart() {Lattice} help.

[Peter Ehlers]

Peng Cai wrote:
> 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!

Use, e.g.

  myYscale <- seq(-0.04, 0.08, 0.02)
  barchart(...,
    ...,
    scales = list(y = list(at = myYscale)),
    ...
  )

  -Peter Ehlers

> 
> 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
>>>
>>>        [[alternative HTML version deleted]]
>>>
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>