[R] padding "bug" in lattice/levelplot

[Paul Boutros]

Hello,

I have encountered some unexpected behaviour with levelplot that may  
simply be a misunderstanding on my part.

If I create a levelplot from a matrix with named columns, some  
"padding" space appears at the top and bottom of the heatmap.  Here is  
an example, and I've used panel.fill to make the space I'm speaking of  
evident (in green).

######################################################
library(lattice);
library(latticeExtra);

data <- matrix(
	nrow = 5,
	ncol = 2,
	data = rnorm(10)
	);
colnames(data) <- c("Col1", "Col2");

levelplot(
	data,
	panel = function(...) {
		panel.fill(col = "green")
		panel.levelplot(...);
		},
	aspect = "fill",
	scales = list(
		x = list(
			labels = NULL,
			tck = c(0,0)
			),
		y = list(
			cex = 3
			)
		),
	xlab = '',
	ylab = ''
	);
######################################################

If I now remove the column names and run the same code, this "padding"  
space disappears.

######################################################
colnames(data) <- NULL;

levelplot(
	data,
	panel = function(...) {
		panel.fill(col = "green")
		panel.levelplot(...);
		},
	aspect = "fill",
	scales = list(
		x = list(
			labels = NULL,
			tck = c(0,0)
			),
		y = list(
			cex = 3
			)
		),
	xlab = '',
	ylab = ''
	);
######################################################

I am looking to create a levelplot that uses the entire area (like the  
second example) but that has labeled rows (like the first).  I'm very  
confused about what's causing this padding, or where to look to remove  
it.  I attempted:
scale = list(x = list(axs = "r"), y = list(axs = "r"))
and that did not alter things.

Here is my system information:

> sessionInfo();
R version 2.7.2 (2008-08-25)
i386-pc-mingw32

locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United  
States.1252;LC_MONETARY=English_United  
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] latticeExtra_0.5-2 RColorBrewer_1.0-2 lattice_0.17-15

loaded via a namespace (and not attached):
[1] grid_2.7.2

Any help/suggestions are very much appreciated,
Paul