Re: [R] coloring individual points in lattice xyplot

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Wed 05 Jul 2006 - 12:29:44 EST

I can get the types to work or the colors but not both:

# this gets the types right but not the colors library(lattice)
x <- 1:10
y <- cbind(y1 = x, y2 = x+1)
cols <- c(rep(1,10), 1:10)
xyplot(y ~ c(x,x), groups = col(y), type = c("o", "p"),

   panel = function(x, y, subscripts, groups, ...)

      panel.superpose.2(x, y, subscripts, groups, col = cols[subscripts], ...) )                         

# this gets the colors right but not the types library(lattice)
x <- 1:10
y <- cbind(y1 = x, y2 = x+1)
cols <- c(rep(1,10), 1:10)
xyplot(y ~ c(x,x), groups = col(y), type = c("o", "p"),

   panel = function(x, y, subscripts, groups, ...)

      panel.xyplot(x, y, col = cols[subscripts], ...) )

On 7/4/06, Gabor Grothendieck <ggrothendieck@gmail.com> wrote:
> On 7/4/06, Deepayan Sarkar <deepayan.sarkar@gmail.com> wrote:
> > On 7/4/06, Gabor Grothendieck <ggrothendieck@gmail.com> wrote:
> > > If I wish to color groups in xyplot I can do this:
> > >
> > > library(lattice)
> > > x <- 1:10
> > > y <- cbind(x, x+1)
> > > xyplot(y ~ rep(x,2), group = col(y), col = 1:2)
> > >
> > > How do I color different points differently within a group.
> > >
> > > For example, I want to produce this plot (except that I only
> > > want to have two groups, not 11):
> > >
> > > xyplot(y ~ rep(x,2), group = c(rep(1, 10), 2:11), col = 1:11)
> > >
> > > I am thinking of something like this (although
> > > this does not work, its just to get the idea across):
> > >
> > > xyplot(y ~ rep(x,2), group = col(y), col = list(1, 2:11))
> > >
> > > where, in general, I have a list with one component per group
> > > whose elements are scalars to color the whole group or
> > > vectors one color per point in the group. I don't know
> > > ahead of time what the list is.
> > >
> > > I am looking for a general approach to this within the lattice
> > > xyplot plot framework; the above is just an example.
> >
> > The general approach is to write your own panel function. For a
> > possible template, look at the functions panel.superpose and
> > panel.superpose.2 and how they handle the 'type' argument.
> >
> > Deepayan
> >

>

> There is no example in ?panel.superpose. Do you think you
> could provide an example for the situation in my post?
>

> I have done quite a bit of RSiteSearch'ing and googling prior to
> posting and all the examples I found had colors that depended
> on the group, none addressed the situation in my post -- i.e.
> coloring individual points within groups.
>

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