[R] xyplot(y~x, type="l") with missing values (NA)

[Cyril Humbert]

With the function plot(x, y, type="l") points are not connected
when x or y contain a missing value (NA). Is it possible to do
the same with the lattice function xyplot() ?

For example:

	library(lattice)
	x <- c(1, 2, NA, 4, 5)
	y <- x
	plot(x, y, type="l")
	xyplot(y~x, type="l")

In the first plot, the point 2 is not connected to the point 4
whereas there are in the second plot.

Thanks
-- 
Cyril 
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