Re: [R] xyplot, groups and colors

From: David Winsemius <>
Date: Fri, 08 Apr 2011 08:29:27 -0400

On Apr 8, 2011, at 8:06 AM, Philipp Pagel wrote:

> Dear ExpeRts,
> I am trying to plot a bunch of growth curves and would like to get
> some more control over groups and line colors than I seem to have.
> Example:
> # make some data
> dat <- Orange
> dat$group <- ifelse(dat$Tree%in%c('1','4','5'), 'A', 'B')
> # plot
> xyplot(circumference~age, dat, groups=group)
> # now use lines to make the growth curve more visible
> xyplot(circumference~age, dat, groups=group, type='l')
> # ugly, because of the 'return' lines
> # to fix this set groups to Tree
> xyplot(circumference~age, dat, groups=Tree, type='l')
> # better, but now each Tree has its own color
> Of course I can now use the col argument to manually assign the colors
> by group but is there a more elegant way that I missed?

You aren't saying what you want but I am guessing it is a color-less plot:

xyplot(circumference~age, dat, groups=Tree, type='l',


trellis.par.set can also be used to specify this globally.

David Winsemius, MD
West Hartford, CT

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Received on Fri 08 Apr 2011 - 12:32:07 GMT

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