[R] ggplot: colours to geom_segments

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Tue Aug 11 16:46:07 CEST 2009


Have a look at scale_colour_manual() (http://had.co.nz/ggplot2/scale_manual.html)



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
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be

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~ Sir Ronald Aylmer Fisher

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~ Roger Brinner

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-----Oorspronkelijk bericht-----
Van: John Kane [mailto:jrkrideau at yahoo.ca] 
Verzonden: dinsdag 11 augustus 2009 16:38
Aan: r-help at 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.


--- On Tue, 8/11/09, ONKELINX, Thierry <Thierry.ONKELINX at inbo.be> wrote:

> From: ONKELINX, Thierry <Thierry.ONKELINX at inbo.be>
> Subject: RE: [R] ggplot: colours to geom_segments
> To: "John Kane" <jrkrideau at yahoo.ca>, r-help at 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

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