Message-ID: <20050519130050.GA8268@jessie.research.bell-labs.com>
Date: 2005-05-19T13:00:51Z
From: David James
Subject: Lattice: how to get default ylim?
In-Reply-To: <244663517.20050519141653@eimb.ru>
Hi,
Within your panel function you can use current.viewport() to recover
the active grid viewport and get xlim/ylim (in addition to other very
useful information). Then you can use grid.text (plus any other
grid.* function), e.g.,
require(grid)
my.panel <-
function(...)
{
panel.xyplot(...)
## add "Hello World on the top-left of each panel
v <- current.viewport() ## requires R 2.1.0 (I believe)
xlim <- v$xscale
ylim <- v$yscale
grid.text(x = xlim[1], y = ylim[2], default.units="native",
label = "Hello World", just= c("left", "top"))
}
Hope this helps.
--
David
Wladimir Eremeev wrote:
> Dear r-help,
>
> I draw graphics with xyplot and want to add some text to each panel
> (actually, the slope, error and significance of a regression line).
>
> I have defined the function, drawing a single panel and pass it to
> xyplot in the panel argument. This function calls panel.xyplot,
> calculates linear regression and formats coefficients.
>
> Now I want the text, I mentioned above, to be put in the upper left
> corner of each plot.
> I use ltext, and I need to define coordinates x and y.
> In order to do this I need to know the limits of x and y axes.
>
> I do not want to pass arguments xlim and ylim to the xyplot function
> and want it to calculate them automatically.
> And I also want to know the result of calculations. :)
> How to do this?
>
> Thank you very much.
>
> --
> Best regards
> Wladimir Eremeev mailto:wl at eimb.ru
>
> ==========================================================================
> Research Scientist, PhD Leninsky Prospect 33,
> Space Monitoring & Ecoinformation Systems Sector, Moscow, Russia, 119071,
> Institute of Ecology, Phone: (095) 135-9972;
> Russian Academy of Sciences Fax: (095) 135-9972
>
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