[R] Re - segments within a lattice graph

John.Gavin@ubsw.com John.Gavin at ubsw.com
Mon Jan 6 12:54:02 CET 2003


The solution to my problem is to use
'lsegments' instead of 'segments' within lattice commands.

(Although I wont forget again, 
a comment in the segments help file referring to 'lsegments' 
might help others not to make the same mistake in the future.)

My thanks to Renaud Lancelot.



John Gavin <john.gavin at ubsw.com>,
Quantitative Risk Models and Statistics,
UBS Warburg, 6th floor, 100 Liverpool St.,
London EC2M 2RH, UK.
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From: John.Gavin at ubsw.com
Date: Mon, 6 Jan 2003 09:08:28 -0000
To: <r-help at stat.math.ethz.ch>
Subject: [R] segments within a lattice graph


I would like to use the segments command 
within a lattice graph. 
Is this allowed in R in the same way as in SPlus?
If not, what is the alternative?

For example, the following produces vertical
line segments between points in SPlus
but in R the line segments are not shown.
(I want to replicate in R what I see in SPlus.)
What is my mistake?

dat <- data.frame(
aa = runif(10),
bb = runif(10),
cc = runif(10)
dat <- dat[order(dat$aa),]
xyplot(cc ~ aa, data = dat,
 panel = function(x, y, ...)
 { # no line segements and no error is printed.
   segments(dat$aa, dat$bb, dat$aa, dat$cc)
   panel.xyplot(dat$aa, dat$cc, col = 1, pch = 1, type = "b")
   panel.xyplot(dat$aa, dat$bb, col = 2, pch = 2, type = "b")
   # no arrows but errors are printed.
   # arrows(dat$aa, dat$bb, dat$aa, dat$cc)
 }, ylim = range(dat$bb, dat$cc)

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