[R] Problem with colormodel in pdf driver

Greg Snow Greg.Snow at imail.org
Sat Jan 24 17:41:15 CET 2009


You may want to consider a dotchart instead of a barplot.  Then you can distinguish between groups by using symbols, grouping, and labels rather than depending on colors/shades of grey.

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Luis Torgo
> Sent: Friday, January 23, 2009 5:22 PM
> To: r-help at r-project.org
> Subject: [R] Problem with colormodel in pdf driver
> 
> I'm trying to create figures in PDF that use the 'gray' colormodel
> instead of the default 'RGB' model, by requirements of a publisher.
> 
> My problem has to do with the fact that I'm not being able to get gray
> colors with this option on the pdf() driver. Here is a small example
> for
> problem replication:
> 
>  > R.version
>                _
> platform       i486-pc-linux-gnu
> arch           i486
> os             linux-gnu
> system         i486, linux-gnu
> status
> major          2
> minor          8.1
> year           2008
> month          12
> day            22
> svn rev        47281
> language       R
> version.string R version 2.8.1 (2008-12-22)
> 
>  > pdf('exp.pdf',colormodel='gray')
>  > barplot(table(subset(iris,Petal.Width>1)$Species))
>  > dev.off()
> 
> Contrary to what I was expecting the bars appear in black and not gray
> as they are supposed to. This is not particularly serious for this toy
> graph but for others it creates more problems.
> 
> Interesting enough this problem does not occur with the same option on
> the postscript() driver as it can be observed by running:
>  > postscript('exp.eps',colormodel='gray')
>  > barplot(table(subset(iris,Petal.Width>1)$Species))
>  > dev.off()
> 
> Any help is most appreciated.
> 
> Luis Torgo
> 
> --
> Luis Torgo
>    FEP/LIAAD - INESC Porto, LA   Phone : (+351) 22 339 20 93
>    University of Porto           Fax   : (+351) 22 339 20 99
>    R. de Ceuta, 118, 6o          email : ltorgo at liaad.up.pt
>    4050-190 PORTO - PORTUGAL     WWW   : http://www.liaad.up.pt/~ltorgo
> 
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