Petr PIKAL <petr.pikal <at> precheza.cz> writes:
>
> I just encountered a strange behaviour trying to plot lattice xyplot with
> dates on x axis
>
> xyplot(rnorm(10)~seq(as.Date("2000/1/1"), by="month",
> length=10)|sample(1:2, 10, replace=T))
>
> Warning message:
> is.na() applied to non-(list or vector) in: is.na(x)
>
> and no points were plotted.
Your example and my attempt to understand what it means works for me:
R 2.6.0, Windows 2000 english, german date settings. Could it be a problem with
cz date settings?
df = data.frame(val=rnorm(10),
dt=seq(as.Date("2000/1/1"), by="month", length=10),
group=sample(1:2, 10, replace=T))
df
xyplot(val~dt|group,data=df)
Dieter
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