[R] ggplot2 - legend for fill coulours

[ONKELINX, Thierry]

Dear Pedro,

Sorting your data before plotting it will probably sort your problem.

plotdata2 <- plotdata2[order(plotdata2$group), ]

HTH,

Thierry

------------------------------------------------------------------------
----
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.Onkelinx op 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: r-help-bounces op r-project.org [mailto:r-help-bounces op r-project.org]
Namens Pedro de Barros
Verzonden: zondag 23 maart 2008 13:02
Aan: r-help op stat.math.ethz.ch
Onderwerp: [R] ggplot2 - legend for fill coulours
Urgentie: Hoog

Dear All,

I am trying to build a stacked bar plot, where I define the colours to
use.

I have asked this before, and I was using a solution in 
http://thread.gmane.org/gmane.comp.lang.r.general/100649/focus=100673 
(thanks, Thierry).

However, it looks this works only when the data are in the sequence 
of the levels in the factor defining the fill colours. When the 
sequence is different, the legend gets "scrambled", in that the order 
of the colours does not match the labels.

My code is below. Can anyone tell me how to get around this? (R 2.2.6 
for Windows, ggplot2 version 2_0.5.7)

Thanks,
Pedro
library(ggplot2)
Data:

 > plotdata2
    x   y  group
1  1 0.1 grey30
2  2 0.2 grey30
3  3 0.3 grey10
4  4 0.4 grey90
5  1 0.1 grey30
6  2 0.2 grey60
7  3 0.3 grey60
8  4 0.4 grey90
9  1 0.1 grey60
10 2 0.2 grey10
11 3 0.3 grey90
12 4 0.4 grey30
13 1 0.1 grey90
14 2 0.2 grey60
15 3 0.3 grey10
16 4 0.4 grey10
 > levels(plotdata2$group)
[1] "grey10" "grey30" "grey60" "grey90"
 > as.numeric(plotdata2$group)
  [1] 2 2 1 4 2 3 3 4 3 1 4 2 4 3 1 1

Code:
plot0<-ggplot()
layer1<-layer(data=plotdata2, mapping=aes_string(x='x',y='y', 
fill='group'),geom='bar', stat='identity', position='stack')
scaleFill<-scale_fill_identity(labels=levels(plotdata2$group), 
guide='tile', name='Group')
scaleY<-scale_y_continuous(limits=c(0,4), expand=c(0,0))
plot1<-plot0+layer1 +scaleFill +scaleY

plot1

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