[R] ggplot 2 semi-transparency error

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Wed Aug 19 10:34:57 CEST 2009

ggplot2 has it's own build in wrapper-function to store plots: ggsave.

p <- ggplot(a,aes(x=V1,colour=V2,fill=V2)) + geom_density(alpha =
ggsave(p, filename = "/alpha/dtc.pdf")



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 rajesh j
Verzonden: woensdag 19 augustus 2009 7:47
Aan: r-help at r-project.org
Onderwerp: [R] ggplot 2 semi-transparency error

I used the command ggplot as follows...
p +  geom_density(alpha = 0.2,xlim=c(-10,10),ylim=c(0,0.5))

when I say,
I get

Warning message:
In grid.Call.graphics("L_polygon", x$x, x$y,
list(as.integer(1L:length(x$x)))) :
  semi-transparency is not supported on this device: reported only once
per page

the pdf has error
any help?

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