Hi,
How might I use xyplot to plot segments where the segments are in the
input data? (ie a directed acyclic forest).
Here's an example in base graphics:
n = data.frame(id = c(1,2,3,4), parent = c(0,1,2,2), value =
c(5,5.5,7,3), date = c(1,2,3,3.5))
plot(n$date, n$value)
do.call(
segments,
with(
merge(n,n,by.x="parent", by.y="id"),
data.frame(x0=date.x, y0=value.x, x1=date.y, y1=value.y)
)
)
xyplot only seems to take an x and a y, and panels only seem to get x
and y.
I can see an lsegments, but I can't see how to use it in this example.
-Alex
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