R help - May 2008 - How to change col and pch between panels in xyplot

Dear R-helpers,

x <- rep(1:2, 4)
y <- c(2, 4, 3, 5, 1, 3, 2, 4)
w <- factor(rep(1:2, each = 4))
v <- rep(1:2, each = 2, 2)
xyplot(y ~ x | w, groups = v, type = 'b')

How do I tell xyplot to use four colors and four plot characters and  
four line types? And how do I set up an appropriate key in each?
_____________________________
Professor Michael Kubovy
University of Virginia
Department of Psychology
USPS:     P.O.Box 400400    Charlottesville, VA 22904-4400
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         McCormick Road    Charlottesville, VA 22903
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WWW:    http://www.people.virginia.edu/~mk9y/





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On Sat, May 17, 2008 at 10:03 PM, Michael Kubovy <kubovy at virginia.edu>
wrote:
> Dear R-helpers,
>
> x <- rep(1:2, 4)
> y <- c(2, 4, 3, 5, 1, 3, 2, 4)
> w <- factor(rep(1:2, each = 4))
> v <- rep(1:2, each = 2, 2)
> xyplot(y ~ x | w, groups = v, type = 'b')
>
> How do I tell xyplot to use four colors and four plot characters and
> four line types? And how do I set up an appropriate key in each?
Maybe (if I understand you correctly)
xyplot(y ~ x | w, groups = interaction(v, w), type = 'b', auto.key =
TRUE)


Or in ggplot2
group <- interaction(v, w)
qplot(x, y, facets = . ~ v, geom=c("point","line"),
colour=group,
shape=group, linetype=group)

although there appears to be a bug in the legend which I need to fix.

Hadley

-- 
http://had.co.nz/