On Wed, Sep 24, 2008 at 7:57 PM, <[EMAIL PROTECTED]> wrote: > > > I have a more complicated function I am trying to write, but I run in to a > problem when I want to > add something to the plot from more than one data set while simultaneously > controlling the > appearance of the additional layer. > > # Toy data: > > foo <- data.frame ( x = 1:4, y = 4:1 , membership = c( "A", "A", "B", "B" ) ) > bar <- data.frame ( x = 1:4 + 1 , y = 4:1 + 1, membership = rep ( "C", 4 ) ) > > # This works, and produces a sensible (unified!) legend: > > foo.gg <- ggplot ( mapping = aes ( x = x, y = y , colour = membership ) ) > foo.gg <- foo.gg + geom_point(data = foo) > foobar.gg <- foo.gg + geom_point ( data = bar ) # works fine, creates a > unified scale showing "membership" > foobar.gg > > # This does not work: > booboo.gg <- foo.gg + geom_point ( data = bar, colour = "black" ) # so far, > so good, but... > booboo.gg # it will not let me over-ride the colour specifications when it > actually tries to construct the graph > > The error message is: > "Error in `[.data.frame`(df, , var) : undefined columns selected" > > System Information: > R version 2.7.2 (2008-08-25) > i386-pc-mingw32 > ggplot2_0.6 > > My goal is to be able to add the additional layer and control its appearance > separately from the appearance of > the first layer. Possible?
This is a bug that caused by an interaction with a bug fix in R 2.7.2. Its fixed in the development version, and I'm working hard to get a new release out as soon as possible. Hadley -- http://had.co.nz/ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
