[R] R versions and PostScript files

[Uwe Ligges]

On 22.07.2011 19:46, pilchat wrote:
> Thank you David, the useRaster=T does the trick! But, unfortunately, it
> doesn't work for persp.
>
> Is there any way to avoid the sRGB colors at the beginning of the R session?
> I tried to edit my Rprofile:
>
>   .First<- function() {
>      a<-system("ls /dati/software/R_lib/*.r",intern=T)
>      for (i in a) source(i) # my personal functions
>      library(MASS)                          # attach a package
> #    library(RColorBrewer)
>      .ps.prolog<- grDevices:::.ps.prolog
>      .ps.prolog[39]<- "/setrgb { setrgbcolor } def"
>
> }
>
> .Last<- function() {
>      graphics.off()                        # a small safety measure.
>      cat(paste(date(),"\nAdios\n"))        # Is it time for lunch?
> }
>
> but it doesn't work either. If I type ".ps.prolog" at the prompt, I get
>
>> .ps.prolog
> Error: object '.ps.prolog' not found
>
> It seems that the .ps.prolog array is not visible outside the .First()
> function.
>
> Moreover, if I comment out "#library(RColorBrewer)", the library is not
> available in my R environment: I have to load it manually. The weirdest
> thing is that, on the contrary, it works for the MASS package!
>
> Is there something wrong with my Rprofile?


1. If
  library(RColorBrewer)
works depends on where it is installed and where you declare the library 
to be on the search path.

2.  For .ps.prolog, you will have to replace "<-" by "<<-" in this 
particular case in order to write this to the Workspace. Otherwise it is 
just a definition within the environment of your .First() call.

3. Alternatively, you may want to consider to add a hook (see ?setHook) 
so that your redefinition always happens after grDevices is loaded.

Best,
Uwe Ligges




> G
>
> On Fri, Jul 22, 2011 at 7:12 PM, James Cloos<cloos+r-help at jhcloos.com>wrote:
>
>> I suspect that a few s/def/bind def/ on that prologue might improve
>> things a bit.
>>
>> The ps R creates freely switches between the sRGB ABC space and
>> setgray.  That is a good thing; it helps ensure that black will
>> be just black when sent to a CMYK device.  Without that you can
>> get CMY black from some devices.  But it does complicate things.
>>
>> (CMYK devices often use CMY black rather than K black when the
>> source is RGB black because it is better when printing contone
>> images, such as photographs.  But it just wastes ink and toner
>> when printing charts and similar graphics.)
>>
>> The best improvement would be to have R keep track of the last
>> colorspace and only run the srgb procedure when switching from
>> DeviceGray, rather than every time it changes the RGB colour.
>>
>> The SetColor() function in R/src/library/grDevices/src/devPS.c
>> looks to be the place to do that.  The Invalidate() function
>> and the PostScriptDesc struct there also need to track any
>> such changes.
>>
>> -JimC
>> --
>> James Cloos<cloos at jhcloos.com>          OpenPGP: 1024D/ED7DAEA6
>>
>> ______________________________________________
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>>
>
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> and provide commented, minimal, self-contained, reproducible code.