Re: [R] plotting to stdout

From: Gene Selkov <selkovjr_at_uchicago.edu>
Date: Fri, 07 Sep 2007 13:15:10 -0500 (CDT)

Thanks a ton, Duncan!

So I have verified that this line works:

   echo "postscript(file=\"\", command=\"cat\"); plot(0)" | r --vanilla --slave

Wonderful! (albeit a little unobvious)

--Gene

On Fri, 7 Sep 2007, Duncan Murdoch wrote:

> On 9/7/2007 12:36 PM, Gene Selkov wrote:
>> I have found two prior instances of this question in R-help, but I can't
>> find the answer, and I'm giving up on mindless tinkering.
>>
>> http://tolstoy.newcastle.edu.au/R/help/03a/5994.html
>> https://stat.ethz.ch/pipermail/r-help/2004-December/062259.html
>>
>> I must be able to pipe the poltting commands to stdin and receive the plot
>> on stdout, with errors written to stderr, should any occur.
>>
>> Here's what I tried:
>>
>> file test.r:
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~
>> postscript(stdout())
>> plot(0)
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~
>>
>> This command:
>>
>> cat test.r | r --vanilla --slave
>>
>> writes the output to a file named "1"
>>
>> I have also tried:
>>
>> postscript(file=stdout())
>> postscript(file=file("stdout"))
>>
>> In the latter case, the output goes to the file named "3".
>>
>> Other graphics devices do the same thing.
>>
>> It is interesting that write.table() supports the file=stdout() idiom. If
>> there is no official option to do this, I will appreciate a hint about the
>> spot in the code where I can fix it.
>
> The ?postscript man page suggests that
>
> postscript(file="", command="cat")
>
> should do what you want (or maybe something other than "cat" for the
> passthrough). The file arg is described as a character string, not a
> connection, so I wouldn't expect stdout() to work. For write.table(), the
> arg is defined to be either the name of a file or an open connection.
>
> Duncan Murdoch
>
>>
>> Thanks,
>>
>> --Gene
>>
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>> sessionInfo()
>> R version 2.5.1 (2007-06-27)
>> i386-apple-darwin8.10.1
>>
>> locale:
>> C
>>
>> attached base packages:
>> [1] "stats" "graphics" "grDevices" "utils" "datasets" "methods"
>> [7] "base"
>>
>> ______________________________________________
>> R-help_at_stat.math.ethz.ch 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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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. Received on Fri 07 Sep 2007 - 18:18:25 GMT

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