R help - Dec 2010 - adding text to the top corner of a lattice plot

Hi, I have a series of lattice plots which I am arranging in a 2x2
grid via print:

print(p.preds, split=c(1,1, 2,2), more=TRUE)
print(p.comp, split=c(2,1,2,2), more=TRUE)
print(p.bw, split=c(1,2,2,2), more=FALSE)

What I'd like to have is a letter (A, B, ...) in the top corner of
each plot. While panel.text lets me add text anywhere within a plot, I
can't seem to workout how I could put some text in the top left
corner, say, of the whole plotting region.

Any pointers would be appreciated

-- 
Rajarshi Guha
NIH Chemical Genomics Center

On Thu, Dec 16, 2010 at 11:12 PM, Rajarshi Guha <rajarshi.guha at
gmail.com> wrote:
> Hi, I have a series of lattice plots which I am arranging in a 2x2
> grid via print:
>
> print(p.preds, split=c(1,1, 2,2), more=TRUE)
> print(p.comp, split=c(2,1,2,2), more=TRUE)
> print(p.bw, split=c(1,2,2,2), more=FALSE)
>
> What I'd like to have is a letter (A, B, ...) in the top corner of
> each plot. While panel.text lets me add text anywhere within a plot, I
> can't seem to workout how I could put some text in the top left
> corner, say, of the whole plotting region.
>

Try this using the built in data frame BOD:

library(lattice)
library(gridExtra)
pnl <- function(..., mark) {
	panel.xyplot(...)
	grid.text(mark, unit(.1, "npc"), unit(.9, "npc"))
}
fo <- demand ~ Time
grid.arrange(nrow = 2,
	xyplot(fo, BOD, mark = "A", panel = pnl),
	xyplot(fo, BOD, mark = "B", panel = pnl),
	xyplot(fo, BOD, mark = "C", panel = pnl)
)


-- 
Statistics & Software Consulting
GKX Group, GKX Associates Inc.
tel: 1-877-GKX-GROUP
email: ggrothendieck at gmail.com

On Dec 16, 2010, at 11:12 PM, Rajarshi Guha wrote:
> Hi, I have a series of lattice plots which I am arranging in a 2x2
> grid via print:
>
> print(p.preds, split=c(1,1, 2,2), more=TRUE)
> print(p.comp, split=c(2,1,2,2), more=TRUE)
> print(p.bw, split=c(1,2,2,2), more=FALSE)
>
> What I'd like to have is a letter (A, B, ...) in the top corner of
> each plot. While panel.text lets me add text anywhere within a plot, I
> can't seem to workout how I could put some text in the top left
> corner, say, of the whole plotting region.
If you are planning on used the internal coordinate system (in terms  
of max and min of the x and y coordinates or whatever the exact  
lattice terminology is) which is what panel.text will be expecting,   
then it is going to depend on the plotting function, arguments, and  
data .... none of which you have not provided. ( It may also depend on  
what you mean when your write "the whole plotting region", since that
is also a bit ambiguous at the moment)

########>>>>>>>>>
> and provide commented, minimal, self-contained, reproducible code.
########>>>>>>>>


David Winsemius, MD
West Hartford, CT