From: John Fox <jfox_at_mcmaster.ca>

Date: Sun 30 Oct 2005 - 06:13:28 EST

symbols <- 1:2

lines <- 1:2

colors <- 1:2

zvals <- levels(z)

xyplot(y~x|z, panel = function(x, y, subscripts, ...) {

* })
*

* })
*

John Fox

Department of Sociology

McMaster University

Hamilton, Ontario

Canada L8S 4M4

905-525-9140x23604

http://socserv.mcmaster.ca/jfox

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sun Oct 30 06:25:51 2005

Date: Sun 30 Oct 2005 - 06:13:28 EST

x <- factor(c("a", "b", "a", "b")) y <- c(1,2,1,2) z <- factor(c("A", "A", "B", "B"))

symbols <- 1:2

lines <- 1:2

colors <- 1:2

zvals <- levels(z)

xyplot(y~x|z, panel = function(x, y, subscripts, ...) {

for (i in 1:length(zvals)) {

sub <- z[subscripts] == zvals[i] llines(x[sub], y[sub], lwd = 2, type = "b", col = colors[i], pch = symbols[i], lty = lines[i]) }

Only the lines (properly coloured with correct line types) appear, but no symbols are plotted. On the other hand, if I call llines() with type="l" and type="p" separately in the panel function, both lines and points appear:

xyplot(y~x|z, panel = function(x, y, subscripts, ...) {

for (i in 1:length(zvals)) {

sub <- z[subscripts] == zvals[i] llines(x[sub], y[sub], lwd = 2, type = "p", col = colors[i], pch = symbols[i], lty = lines[i]) llines(x[sub], y[sub], lwd = 2, type = "l", col = colors[i], pch = symbols[i], lty = lines[i]) }

I've looked at both the documentation and code for llines() and lplot.xy(), which llines() calls, and don't see the source of the problem.

I'm using R 2.2.0 under Windows XP. I'm pretty sure that this used to work, but I got the same problem in R 2.1.1 when I tried it there.

Any help would be appreciated.

Thanks,

John

John Fox

Department of Sociology

McMaster University

Hamilton, Ontario

Canada L8S 4M4

905-525-9140x23604

http://socserv.mcmaster.ca/jfox

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sun Oct 30 06:25:51 2005

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