R help - Nov 2009 - lattice: plotting in a loop

Hi,

I'm having trouble seeing graphics output from lattice xyplot() when called
from inside a for loop:

x <- 1:50
for ( i in 1:5 ) {
  y <- rnorm(x)
  xyplot(y~x)          # no graphics when inside for-loop
# plot(x,y)            # works fine
# Sys.sleep(0.5)       # doesn't seem to help
}

The xyplot() is fine outside the loop.  Results are the same to X11 device
and to file devices.

I have noticed that there is a delay proportional to the size of the loop,
so presumably xyplot() is computing although the results aren't reaching the
graphics device.

Can anyone suggest a cause or remedy?

This is my first post to the list, although I've picked up a lot of useful
information reading here!

-Ryan

	[[alternative HTML version deleted]]

Hi,
it's a FAQ, you need to print() the plot,

http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-do-lattice_002ftrellis-graphics-not-work_003f

baptiste

2009/11/25 Ryan Archer <ra.lists.r at gmail.com>:
> Hi,
>
> I'm having trouble seeing graphics output from lattice xyplot() when
called
> from inside a for loop:
>
> x <- 1:50
> for ( i in 1:5 ) {
> ?y <- rnorm(x)
> ?xyplot(y~x) ? ? ? ? ?# no graphics when inside for-loop
> # plot(x,y) ? ? ? ? ? ?# works fine
> # Sys.sleep(0.5) ? ? ? # doesn't seem to help
> }
>
> The xyplot() is fine outside the loop. ?Results are the same to X11 device
> and to file devices.
>
> I have noticed that there is a delay proportional to the size of the loop,
> so presumably xyplot() is computing although the results aren't
reaching the
> graphics device.
>
> Can anyone suggest a cause or remedy?
>
> This is my first post to the list, although I've picked up a lot of
useful
> information reading here!
>
> -Ryan
>
> ? ? ? ?[[alternative HTML version deleted]]
>
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