R help - Sep 2009 - bwplot scales in alphabetical order

Dear List,

I know this has been covered before, but I don't seem to be able to get it
right.  I am constructing a boxplot in lattice and can't get the scales in
the correct alphebetical order.  I have already read that this is due to the way
factors are treated, and I have to redefine the levels of the factors.  However,
I have failed.
As a simple example:

library(lattice)
id<-rep(letters[1:9], each=20)
x<-rep(seq(1:10),each=18)
y<-rnorm(180,50,20)

#Reverse alphebetical order
  bwplot(y~x|id, horizontal=FALSE)

#alphebetical order reading right to left
  id<-factor(id,levels = sort(id,decreasing = TRUE))
  bwplot(y~x|id, horizontal=FALSE)

It appears that bwplot plots scales from the bottom left to the top right. If so
my factor levels would need to be levels=c(7,8,9,4,5,6,1,2,3). I tried that but
can't seem to get the factor function to work.

#Did not work!
id<-factor(id,levels=c(7,8,9,4,5,6,1,2,3),lables=letters[1:9])

Your help would be greatly appreciated.

Tim





Tim Clark
Department of Zoology 
University of Hawaii

Tim,

Add the argument as.table=TRUE to your call:

   bwplot(y~x|id, horizontal=FALSE, as.table=TRUE)

Peter Ehlers

Tim Clark wrote:
> Dear List,
> 
> I know this has been covered before, but I don't seem to be able to get
it right.  I am constructing a boxplot in lattice and can't get the scales
in the correct alphebetical order.  I have already read that this is due to the
way factors are treated, and I have to redefine the levels of the factors. 
However, I have failed.
> As a simple example:
> 
> library(lattice)
> id<-rep(letters[1:9], each=20)
> x<-rep(seq(1:10),each=18)
> y<-rnorm(180,50,20)
> 
> #Reverse alphebetical order
>   bwplot(y~x|id, horizontal=FALSE)
> 
> #alphebetical order reading right to left
>   id<-factor(id,levels = sort(id,decreasing = TRUE))
>   bwplot(y~x|id, horizontal=FALSE)
> 
> It appears that bwplot plots scales from the bottom left to the top right.
If so my factor levels would need to be levels=c(7,8,9,4,5,6,1,2,3). I tried
that but can't seem to get the factor function to work.
> 
> #Did not work!
> id<-factor(id,levels=c(7,8,9,4,5,6,1,2,3),lables=letters[1:9])
> 
> Your help would be greatly appreciated.
> 
> Tim
> 
> 
> 
> 
> 
> Tim Clark
> Department of Zoology 
> University of Hawaii
> 
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