[R] labeling in qplot

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Wed Aug 5 10:03:38 CEST 2009

Dear Mo,

This is rather easy. Add an ID to each data series, rbind them into one
data.frame and use the colour argument of qplot.

data1 <- data.frame(corArms = rnorm(1000))
data2 <- data.frame(corArms = rnorm(3000, sd = 0.5))
data3 <- data.frame(corArms = rnorm(2000, sd = 2))

data1$ID <- "Data 1"
data2$ID <- "Data 2"
data3$ID <- "Data 3"

dataset <- rbind(data1, data2, data3)
qplot(corArms, data = dataset, colour = ID, geom = "density",
adjust=0.4, main="Arms Correlation All")



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

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
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens Mohan S
Verzonden: woensdag 5 augustus 2009 5:16
Aan: r-help at r-project.org
Onderwerp: [R] labeling in qplot


  am plotting different density plots in one graph each with a different

  And i want to add labels to plot mentioning which color belongs to
which data series.

p2 <- qplot(corArms, data = data1, geom = "density", adjust=0.4,
main="Arms Correlation All") + layer(data=data2, geom="density",
adjust=0.4, color=I(2)) + layer(data=data3, geom="density", adjust=0.4,

  how can i add such a legend. Any pointers?

thanks a million

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