[R] ggplot2: labels points with different colors or idnumbers

[ONKELINX, Thierry]

Dear Tom,

I think you better switch to ggplot() instead of qplot().

library(ggplot2)
dat <- expand.grid(id = 1:10, time = 1:3, group = 1:3)
dat$Freq <- rnorm(nrow(dat), mean = dat$id * dat$time)
ggplot(dat, aes(x = factor(time), y = Freq)) + geom_boxplot() + geom_jitter(aes(colour = factor(id)))

But you can do it with qplot()

qplot(factor(dat$time), dat$Freq, dat, geom = "boxplot") + geom_jitter(aes(colour = factor(dat$id))) 

IMO the ggplot version gives more readable code. Especially when you are doing complex plots.

Splitting plots according to a factor is easy with facet_grid() or facet_wrap().

dat <- expand.grid(id = 1:10, time = 1:3, Group = 1:3)
dat$Freq <- rnorm(nrow(dat), mean = dat$id * dat$time)
ggplot(dat, aes(x = factor(time), y = Freq)) + geom_boxplot() + geom_jitter(aes(colour = factor(id))) + facet_grid(. ~ Group)

If you want three different plots then you will need to do some reading on viewports, grobs and stuff. The ggplot2 book on Hadley's website give a good intro.

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 at inbo.be 
www.inbo.be 

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~ 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 at r-project.org [mailto:r-help-bounces at r-project.org] Namens Tom Cohen
Verzonden: donderdag 26 februari 2009 13:05
Aan: r-help at r-project.org
Onderwerp: [R] ggplot2: labels points with different colors or idnumbers

Dear list,
 
Using ggplot2 I could produce both boxplot and points in the same plot but instead of points I would like to label the different
subjects with different colors or their idnumbers. Is there away to do it? Also how can I put three plots on the same graph with ggplot2? 
mfrow=c(3,1) did not do the job. 
 
> dat
   group time   id  freq
1      1   00 0018  5.21
2      1   00 3026  3.13
3      1   00 5030  5.04
4      1   00 5108  3.23
5      1   00 5152  3.97
6      1   00 6080  0.16
7      1   01 0018  4.89
8      1   01 3026  6.58
9      1   01 5030  7.42
10     1   01 5108 10.10
11     1   01 5152  3.74
12     1   01 6080  0.81
 
library(ggplot2)
qplot(factor(dat$time),dat$freq,dat,geom=c("boxplot","jitter"),
    ylab=names(dat[,4]),xlab="time") 



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