On Tue, May 5, 2009 at 8:58 AM, Greg Snow <greg.s...@imail.org> wrote: > The function that is doing the color assignments is level.colors in the > lattice package. > Looking at the code confirms that the number of colors should be 1 less than > the length > of the at variable (the documentation implies that it should be 1 more, looks > like a documentation bug to me).
Could you point to the place where this is implied? I couldn't see anything obviously wrong in ?levelplot or ?level.colors. > It is possible that at one time the author intended to prepend -Inf and > append Inf to the at > vector so that it did not need to span the entire range of the data, but that > was not implemented. > I think I would prefer that fix to changing the documentation. That is a slightly different issue though: e.g., > level.colors(c(1, 2, 3), at = c(1.5, 2.5, 3.5), colors = FALSE) [1] NA 1 2 The first value doesn't fall in any interval, so gets a NA. level.colors() is mainly a helper function for levelplot(), and it is important there that the first and last intervals not be open-ended. levelplot() has no 'zlim' argument, and you need 'at' to restrict the values shown, e.g., levelplot(volcano, at = do.breaks(c(120, 200), 10)) -Deepayan ______________________________________________ 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.
