Ah, it's a FAQ ... thought I'd looked hard enough.  The ignominy, and for a
first post!  Well, in any case, thanks a lot Baptiste.

2009/11/25 baptiste auguie <baptiste.auguie@googlemail.com>

> 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@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]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>

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