[R] xyplot auto.key issue

From: Mike Lawrence <Mike.Lawrence_at_dal.ca>
Date: Sun 31 Jul 2005 - 05:04:37 EST

Hi all,

I'm having a problem with the auto.key function in xyplot. I hate to bother the list like this and I'm positive I must be missing something very simple, yet I've spent the last day searching for a solution to no avail.

Essentially, I want a key that contains entries in which the plot points are superimposed on a line of the same color as the points, like this: o--o--o Now, given the presence of the default "divide" command, I assume this is simple; indeed, I get the impression that this representation is supposed to be produced automatically. Yet I can't seem to get it to work!

Now, I've incorporated various other tweaks to my xyplot function, so I'm wondering if these tweaks are somehow hindering my efforts. The function is pasted below; I am making a 3x3 plot, each panel contains 5 lines and it is these lines that I want represented in the key. See the comments for descriptions of the modifications.

Any help would be greatly appreciated.




#basic settings

	bias ~ sample_size | measure,
	data = bias,
	groups = exp_tau,
	type = "b",
	pch = c(1,2,3,4,5),

#make strips transparent
strip = function(bg, ...) strip.default(bg = 'transparent', ...),
# tweak scales
scales=list( x=list( at = c(20, 40, 60), tck = c(1,0), alternating = F ), y=list( at = c(-50, -25, 0, 25, 50), tck = c(1,0), alternating = F ) ),
# tell key to match symbols to those used in the plot
par.settings = list( superpose.symbol = list( cex = .8, pch = c(1,2,3,4,5) ), lines = T, type = "b" ),
# key settings
auto.key = list ( lines = T, size = 7, border = T, cex.title = 1.2, title = "Expected Tau", text = c("30 ms", "80 ms", "130 ms", "180 ms", "230 ms"), space = "right", )


Mike Lawrence, BA(Hons)
Research Assistant to Dr. Gail Eskes
Dalhousie University & QEII Health Sciences Centre (Psychiatry)


"The road to Wisdom? Well, it's plain and simple to express:
Err and err and err again, but less and less and less."
- Piet Hein

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Received on Sun Jul 31 05:11:20 2005

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