R help - Aug 2009 - ggplot 2 semi-transparency error

Hi,
I used the command ggplot as follows...
p<-ggplot(a,aes(x=a$V1,colour=a$V2,fill=a$V2))
p +  geom_density(alpha = 0.2,xlim=c(-10,10),ylim=c(0,0.5))

when I say,
dev.print(device=postscript,file="/alpha/dct.pdf")
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?
-- 
Rajesh.J

	[[alternative HTML version deleted]]

I really don't know anything much about this but I tried
"device=pdf"
(no-quotes) and I got a pdf file with transparent plots.

?device.print gives help with some links to other devices

hth


rajesh j wrote:
> 
> Hi,
> I used the command ggplot as follows...
> p<-ggplot(a,aes(x=a$V1,colour=a$V2,fill=a$V2))
> p +  geom_density(alpha = 0.2,xlim=c(-10,10),ylim=c(0,0.5))
> 
> when I say,
> dev.print(device=postscript,file="/alpha/dct.pdf")
> I get
> 
> Warning message:
> In grid.Call.graphics("L_polygon", x$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?
> -- 
> Rajesh.J
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 
-- 
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rajesh j wrote:
> 
> I used the command ggplot as follows...
> p<-ggplot(a,aes(x=a$V1,colour=a$V2,fill=a$V2))
> p +  geom_density(alpha = 0.2,xlim=c(-10,10),ylim=c(0,0.5))
> 
> when I say,
> dev.print(device=postscript,file="/alpha/dct.pdf")
> I get
> 
> Warning message:
> In grid.Call.graphics("L_polygon", x$x, x$y,
> list(as.integer(1L:length(x$x)))) :
>   semi-transparency is not supported on this device: reported only once
> per
> page
> 
> 
It is a bit unconventional to expect a pdf when using the postscript device,
that might explain the error when you open it, because you created a ps
file.

My personal preference is not to use dev.print at all, but to open the
output device before doing the plot.

A self-contained example would be nice.

Dieter


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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
0.2,xlim=c(-10,10),ylim=c(0,0.5))
ggsave(p, filename = "/alpha/dtc.pdf")

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

Hi,
I used the command ggplot as follows...
p<-ggplot(a,aes(x=a$V1,colour=a$V2,fill=a$V2))
p +  geom_density(alpha = 0.2,xlim=c(-10,10),ylim=c(0,0.5))

when I say,
dev.print(device=postscript,file="/alpha/dct.pdf")
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?
--
Rajesh.J

	[[alternative HTML version deleted]]

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

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