[R] Displaying data in Trellis

[ilai]

On Wed, Apr 18, 2012 at 8:45 AM, slavrenz <stevelavrenz at hotmail.com> wrote:

 I would like to display with the xyplot() function
> for several states. I will have a total of 6 plots, I need to plot the
> points of one of the states in a different color than all the rest, such
> that they can be more easily referenced in a presentation. Does anyone know
> what I can use for this. I'm guessing that I will have to write my own panel
> function,

You guessed wrong... One way is

xyplot(rnorm(60)~runif(60)|gl(6,10),groups=c(rep(1,30),rep(2,10),rep(1,20)))

Or even as a panel function it is rather simple

xyplot(rnorm(60)~runif(60)|gl(6,10),
 panel=function(x,y,...){
  mycols <- trellis.par.get('superpose.symbol')$col
  whichpan <- 1+(packet.number()==4)
  panel.xyplot(x,y,col=mycols[whichpan],...)
 }
)

Working through the examples in xyplot and applying a little brain you
should have been able to come up with a way that best fits your
situation. If for some reason you do get stuck in the future, please
post a reproducible example. BTW, if this is for your own
dissertation/presentation - why "can't be changed ? " shouldn't you be
more worried about presenting a "non suitable plot" than it's colors ?

Cheers

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