R help - Apr 2004 - dataframe: visualization as tiles(?)

Dear R users,

I remember seeing somewhere a method of visualizing a set of 
observations on two variables x and y in the following way

	   x=0       x=1

	|-------| |-------|
  y=-1	|	| |	  |
	|-------| |	  |
	 	  |	  |
	|-------| |	  |
	|	| |-------|
  y=0	|	|
	|	| |-------|
	|-------| |	  |
	 	  |-------|
	|-------|
  y=1	|       | |-------|
	|-------| |-------|

where x = 0 or 1; y = -1, 0, 1. The 'tile' area represents 
the count of observations with corresponding x and y values.

Now, I don't remember what is the name of the functions that 
support such plots.

I tried help.search("*tile*"); I skimmed the documentation of 
the 'lattice' package. Both seem not to be what I remembered.

Please send me pointers.

	Thanks in advance
	Itay

>
> Dear R users,
>
> I remember seeing somewhere a method of visualizing a set of
> observations on two variables x and y in the following way
Is this what you want?
> ## fake data
> zz <- data.frame(x=sample(0:1,20,rep=T),y=sample((-1:1),20,rep=T))
> zz
> ## tabulate it
> zz.tab <- data.frame(table(zz))
> zz.tab
> library(lattice)
> barchart(y ~ Freq | x, data=zz.tab)
Cheers

Jason

Whoops - didn't get what you meant

?mosaicplot

is your friend

Cheers
Jason

Thanks, but no. In the method that I remember the plot was an 
assortment of oblong(?) tiles, optionally color coded, and 
filling a square region.
According to my recollection it was possilbe to add more 
variables, in which case each tile is broken down further into 
sub-tiles.

	Itay


 On Wed, 14 Apr 2004, Jason Turner wrote:
> >
> > Dear R users,
> >
> > I remember seeing somewhere a method of visualizing a set of
> > observations on two variables x and y in the following way
> 
> Is this what you want?
> 
> > ## fake data
> > zz <- data.frame(x=sample(0:1,20,rep=T),y=sample((-1:1),20,rep=T))
> > zz
> 
> > ## tabulate it
> > zz.tab <- data.frame(table(zz))
> > zz.tab
> > library(lattice)
> > barchart(y ~ Freq | x, data=zz.tab)
> 
> Cheers
> 
> Jason
>