Lattice: how to get default ylim?
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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