John, Have a look at scale_colour_manual() (http://had.co.nz/ggplot2/scale_manual.html)
HTH, Thierry PS My solution was exactly the same as Paul's. ---------------------------------------------------------------------------- ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, methodology and quality assurance Gaverstraat 4 9500 Geraardsbergen Belgium tel. + 32 54/436 185 thierry.onkel...@inbo.be www.inbo.be To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher The plural of anecdote is not data. ~ Roger Brinner The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey -----Oorspronkelijk bericht----- Van: John Kane [mailto:jrkrid...@yahoo.ca] Verzonden: dinsdag 11 augustus 2009 16:38 Aan: r-h...@stat.math.ethz.ch; ONKELINX, Thierry Onderwerp: RE: [R] ggplot: colours to geom_segments > Paul Emberson > "You need to map colour to a variable. Try > geom_segment(mapping=aes(colour=Food)) " That did it. Apparently I have not gotten to 'mapping' yet in the book! > Thierry.ONKELINX > You need to change colour = "darkgreen" into aes(colour = Food). This > will give a different colour along Food. Not exactly, Thierry, I wanted to change the line colours but your solution has solved my next problem which was to make the points and the lines have the same colours. Thanks to both of you. Next Question How do I select colours rather than using the predetermined ones? I know that I should, at least, be able to use RColorBrewer but I have not figured out how yet. Thanks again. John --- On Tue, 8/11/09, ONKELINX, Thierry <thierry.onkel...@inbo.be> wrote: > From: ONKELINX, Thierry <thierry.onkel...@inbo.be> > Subject: RE: [R] ggplot: colours to geom_segments > To: "John Kane" <jrkrid...@yahoo.ca>, r-h...@stat.math.ethz.ch > Received: Tuesday, August 11, 2009, 5:35 AM Dear John, > > You need to change colour = "darkgreen" into aes(colour = Food). This > will give a different colour along Food. > > HTH, > > Thierry > > ---------------------------------------------------------------------- > -- > Just as an exercise I am tying to add colours to a geom_segment > command. > I can get one colour but not a sequence of colours. Can anyone suggest > how I can get the green lines in the plot below to be different > colours? I thought I could use a palatte of colours but that did not > seem to work. > > Thanks > > ====================================================================== > == > = > > library(ggplot2) > > xx <- structure(list(Food = structure(c(2L, 1L, 3L, 4L), .Label = > c("Bread", "Milk", "Potatoes", "Rice"), class = "factor"), Expense = > c(25, 49, 34, 15)), .Names = c("Food", "Expense"), row.names = c(NA, > -4L), class = "data.frame") > > p <- ggplot(xx, aes(x = 0, xend = Expense, y = Food, yend = Food)) pa > <- p + geom_point(aes(Expense, Food)) + > > geom_segment(colour="darkgreen") + > xlab("Food") + > geom_vline(xintercept=40, colour='red') pa __________________________________________________________________ Looking for the perfect gift? Give the gift of Flickr! http://www.flickr.com/gift/ Dit bericht en eventuele bijlagen geven enkel de visie van de schrijver weer en binden het INBO onder geen enkel beding, zolang dit bericht niet bevestigd is door een geldig ondertekend document. The views expressed in this message and any annex are purely those of the writer and may not be regarded as stating an official position of INBO, as long as the message is not confirmed by a duly signed document. ______________________________________________ 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.
