[R] ggplot: adding layer using different data, groups and also controlling appearance

[ONKELINX, Thierry]

Dear Juliet,

I think you want this

dataset <- rbind(foo, bar)
ggplot(dataset, aes(x = x, y = y, colour = membership)) + geom_point() +
scale_colour_manual(values = c("green", "red", "black"))

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 

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 at r-project.org [mailto:r-help-bounces at r-project.org]
Namens Juliet Hannah
Verzonden: woensdag 31 december 2008 18:08
Aan: hadley wickham
CC: r-help at r-project.org
Onderwerp: Re: [R] ggplot: adding layer using different data,groups and
also controlling appearance

foo <- data.frame ( x = 1:4, y = 4:1 , membership = c( "A", "A", "B",
"B" ) )
bar <- data.frame ( x = 1:4 + 1 , y = 4:1 + 1, membership = rep ( "C", 4
) )

foo.gg <- ggplot ( mapping =  aes ( x = x, y = y , colour = membership )
)
foo.gg <- foo.gg + geom_point(data = foo)

booboo.gg <- foo.gg + geom_point ( data = bar, colour = "black" )
booboo.gg

Should "C" be updated manully. Thanks!

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