Hi, David,
Thanks. It is working perfectly now. But I still don't understand the
argument "page", I couldn't find it in text() or par(). Also in the "page =
function(n){......}" the argument "n" does not appear anywhere and it seems
OK to be replaced with any other letter. Can anyone explain it a little bit?
Jun
On Sat, Apr 24, 2010 at 4:14 PM, David Winsemius <dwinsem...@comcast.net>wrote:
>
> On Apr 24, 2010, at 4:52 PM, Jun Shen wrote:
>
> Hi,
>>
>> I also want to show user's name at the lower-left corner. So I added one
>> more line to Deepayan's code but it didn't work. I am not sure how to use
>> the "page" argument here. Appreciate any comment.
>>
>> lattice.options(default.args = list(page = function(n) {
>> panel.text(lab = sprintf("%s", date()), x = 0.99, y = 0.02, adj = 1)
>> panel.text(lab = sprintf("%s", paste("User:",Sys.getenv("USERNAME"))), x
>> = 0.01, y = 0.02)
>> }))
>>
>>
> Using 0 for the adj argument:
>
>
> lattice.options(default.args = list(page = function(n) {
> panel.text(lab = sprintf("%s", date()), x = 0.99, y = 0.02, adj = 1)
> panel.text(lab = sprintf("%s", paste("User:",Sys.getenv("USERNAME"))),
> x = 0.01, y = 0.02, adj=0)
> }))
>
> > xyplot(1~1) # works
>
> Seems to work. Panel.text did not help me, but it pointed to the base
> graphics functions which I interpreted to be text() and in the Details
> section it does.
>
> --
> David
>
>
> Jun
>>
>> On Fri, Apr 23, 2010 at 10:32 AM, Deepayan Sarkar <
>> deepayan.sar...@gmail.com> wrote:
>> On Wed, Apr 21, 2010 at 4:02 PM, David Winsemius <dwinsem...@comcast.net>
>> wrote:
>> >
>> > On Apr 21, 2010, at 6:58 PM, David Winsemius wrote:
>> >
>> >> 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)
>> >> })
>> >>
>> >
>> > Furthermore when I try:
>> >
>> > mtext(date(), side=3, line=4, adj=0)
>> >
>> > .... I get a datetime stamp even though I am mixing graphic paradigms.
>> This
>> > would seem to be one of those instances where you needn't worry about
>> > getting the internal coordinates to match up.
>>
>> Appearances can be deceiving. Try to create a PDF file with this, and
>> you will get
>>
>> > pdf()
>> > xyplot(1 ~ 1)
>> > mtext(date(), side=1, line=4, adj=0)
>> Error in mtext(date(), side = 1, line = 4, adj = 0) :
>> plot.new has not been called yet
>> > dev.off()
>>
>> Try to copy the screen device to PDF, and you will get
>>
>> > dev.copy(pdf, file = "/tmp/foo.pdf")
>> Error in dev.copy(pdf, file = "/tmp/foo.pdf") : invalid graphics state
>>
>> For a footnote in lattice plots, page is the appropriate argument to
>> use. Adapting an example from the book (section 9.3), the following
>> will add a timestamp to all subsequent lattice plots:
>>
>> lattice.options(default.args = list(page = function(n) {
>> panel.text(lab = sprintf("%s", date()), x = 0.99, y = 0.05, adj = 1)
>> }))
>>
>> xyplot(1 ~ 1)
>>
>>
>> -Deepayan
>>
>>
> David Winsemius, MD
> West Hartford, CT
>
>
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