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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"),

Hi there, I'm trying to find out the command to stop clipping to plot region in ggplot. I have a bar chart (axis flipped) with labels on the bars, but the labels are clipped at the plot region box. I know it's possible to turn this off for base and lattice, but how about ggplot? par(xpd=NA) The ggplot2 manual doesn't seem to mention it, and a search for ggplot and

summary: The function 'by' inconsistently strips class from the data to which it is applied. quick reason: tapply strips class when simplify is set to TRUE (the default) due to the class stripping behaviour of unlist. quick answer: This can be fixed by invoking tapply with simplify=FALSE, or changing tapply to use do.call(c instead of unlist executable example: