[R] How to suppress the empty plots in xyplot (lattice)

[Jeff Newmiller]

Set up a single (factor) variable that identifies the combinations that exist, and plot using that variable.
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Sent from my phone. Please excuse my brevity.

Jun Shen <jun.shen.ut at gmail.com> wrote:

>Dear all,
>
>In a plot command like
>
>xyplot(Y~X|ID*PERIOD,data=...)
>
>xyplot will generate all the possible ID*PERIOD combinations. But not
>all
>of them have data in there. So I have a lot of empty plots. How can I
>suppress those empty plots and ask xyplot only to generate plots
>actually
>with data. Thanks.
>
>Jun
>
>	[[alternative HTML version deleted]]
>
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