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@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. ______________________________________________ R-help@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.
