Sarkar offers a worked example of taking user input regarding location for locating a grid viewport outside the plot area.

http://lmdvr.r-forge.r-project.org/figures/figures.html

See Figure 12.1

state <- data.frame(state.x77, state.region)
trellis.vpname("xlab", prefix = "plot1")
trellis.vpname("strip", column = 2, row = 2, prefix = "plot2")


data(Chem97, package = "mlmRev")
qqmath(~ gcsescore | factor(score), Chem97, groups = gender,
       f.value = function(n) ppoints(100),
       aspect = "xy",
       page = function(n) {
           cat("Click on plot to place legend", fill = TRUE)
           ll <- grid.locator(unit = "npc")
           if (!is.null(ll))
               draw.key(simpleKey(levels(factor(Chem97$gender))),
                        vp = viewport(x = ll$x, y = ll$y),
                        draw = TRUE)
       })

--
David.

On Apr 21, 2010, at 6:32 PM, Jun Shen wrote:

Thanks, David.

mtext is for "graphics". Is there an equivalent function for "lattice"?

Jun

On Wed, Apr 21, 2010 at 4:44 PM, David Winsemius <dwinsem...@comcast.net > wrote:

On Apr 21, 2010, at 5:41 PM, Jun Shen wrote:

Dear all,

How do stamp my graphs with date and time somewhere like left corner of the graph (not the plotting area). I know date() and Sys.time(), but where to?
Thanks.

?mtext


Jun

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David Winsemius, MD
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David Winsemius, MD
West Hartford, CT

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