[R] coloring individual points in lattice xyplot

[Gabor Grothendieck]

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 at gmail.com> wrote:
> On 7/4/06, Deepayan Sarkar <deepayan.sarkar at gmail.com> wrote:
> > On 7/4/06, Gabor Grothendieck <ggrothendieck at 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.
>