[R] readline() and Rterm in Windows

[Mikkel Grum]

And that was the only combination I didn't try, duhh.
As you say, it works. Excellent! TX! They'll be a
number of pleased usres too.

--- Duncan Murdoch <murdoch at stats.uwo.ca> wrote:

> Mikkel Grum wrote:
> > I've tried your proposal in a number of ways, and
> > there must be something I'm not understanding. If
> I
> > run your script (using source() in RGui, or ctrl-R
> > from the R Editor, I get:
> 
> It requires a command line console, i.e. it will
> only work in Rterm, not 
> Rgui.  I was assuming you'd run it using the style
> of your batch file 
> down below, but without changing the paths.
> 
> Duncan Murdoch
> > 
> > 
> >>conout <- file('CONOUT$','w')
> > 
> > Error in file("CONOUT$", "w") : unable to open
> > connection
> > In addition: Warning message:
> > cannot open file 'CONOUT$', reason 'Permission
> denied'
> > 
> > 
> > 
> > so I added the path as in:
> > 
> > conout <- file('C:\\R\\R-2.2.0\\CONOUT$','w')
> > conin <- file('C:\\R\\R-2.2.0\\CONIN$', 'r')
> > cat('Please enter an ID:', file=conout)
> > flush(conout)
> > id <- readLines(conin, 1)
> > print(id)
> > 
> > 
> > Using RGui and ctrl-R from the R Editor, I get
> > 
> > 
> >>conout <- file('C:\\R\\R-2.2.0\\CONOUT$','w')
> >>conin <- file('C:\\R\\R-2.2.0\\CONIN$', 'r')
> > 
> > Error in file("C:\\R\\R-2.2.0\\CONIN$", "r") : 
> >         unable to open connection
> > In addition: Warning message:
> > cannot open file 'C:\R\R-2.2.0\CONIN$', reason 'No
> > such file or directory' 
> > 
> >>cat('Please enter an ID:', file=conout)
> >>flush(conout)
> >>id <- readLines(conin, 1)
> > 
> > Error in readLines(conin, 1) : object "conin" not
> > found
> > 
> > and with
> > 
> >>source("foo.R")
> > 
> > Error in file("C:\\R\\R-2.2.0\\CONIN$", "r") : 
> >         unable to open connection
> > In addition: Warning message:
> > cannot open file 'C:\R\R-2.2.0\CONIN$', reason 'No
> > such file or directory' 
> > 
> > 
> > When I create a batch file with the following
> command
> > :
> > C:\R\R-2.2.0\bin\Rterm.exe --vanilla
> > <C:\R\R-2.2.0\foo.R> C:\R\R-2.2.0\foo.out
> > 
> > and double click on the batch file, the out file
> gives
> > me:
> > 
> > R : Copyright 2005, The R Foundation for
> Statistical
> > Computing
> > Version 2.2.0  (2005-10-06 r35749)
> > ISBN 3-900051-07-0
> > . . .
> > Type 'q()' to quit R.
> > 
> > 
> >>conout <- file('C:\\R\\R-2.2.0\\CONOUT$','w')
> >>conin <- file('C:\\R\\R-2.2.0\\CONIN$', 'r')
> > 
> > 
> > and nothing else. In none of the situations do I
> get
> > prompted for input. What am I doing hopelessly
> wrong?
> > 
> > Mikkel
> > 
> > --- Duncan Murdoch <murdoch at stats.uwo.ca> wrote:
> > 
> > 
> >>Mikkel Grum wrote:
> >>
> >>>Duncan and Prof, thanks for your comments and
> >>>apologies for not being more specific. I'm not
> >>
> >>getting
> >>
> >>>the same results you get from the steps you
> >>
> >>propose.
> >>
> >>>If I write a script foo.R with two lines
> >>>
> >>>	id <- readline("Please enter an ID: ")
> >>>	id
> >>>
> >>>and then use source("foo.R") (either at the Rterm
> >>>prompt, or in RGui) it is true that get prompted,
> >>
> >>but
> >>
> >>>the second line does not visibly run, i.e. I get
> >>>
> >>>
> >>>>source("id.r")
> >>>
> >>>Please enter an ID: 5
> >>>
> >>>
> >>>and if I then type id, I get
> >>>
> >>>
> >>>>id
> >>>
> >>>[1] "id"
> >>>
> >>>If I cut and paste the two lines in RGui (in one
> >>
> >>go),
> >>
> >>>I get
> >>>
> >>>
> >>>>id <- readline("Please enter an ID: ")
> >>>
> >>>Please enter an ID: id
> >>>
> >>>
> >>>What I really want is a batch file on the desktop
> >>
> >>with
> >>
> >>>the following commands:
> >>>
> >>>   c:\r\R-2.2.0\bin\Rterm.exe --no-save
> >>
> >>--no-restore
> >>
> >>><script.R> script.out 2>&1
> >>>   c:\texmf\miktex\bin\latex
> >>>\nonstopmode\input{blue.tex}
> >>>
> >>>
> >>>and script.R reads something like:
> >>>
> >>>   id <- readline("Please enter an ID: ")
> >>>   id
> >>>   Sweave("blue.Rnw")
> >>>
> >>>I said that script.R didn't run, which was an
> >>>incorrect description. It runs without prompting
> >>
> >>for
> >>
> >>>the ID, and gives error messages all through
> >>
> >>because
> >>
> >>>blue.Rnw needs the id.
> >>>
> >>>This is a very simplified version of what I'm
> >>
> >>doing,
> >>
> >>>but if I use only the first line of the batch
> file
> >>
> >>and
> >>
> >>>the first two lines of the script and could get
> >>
> >>that
> >>
> >>>to work, I could figure out the rest.
> >>
> >>It won't work so simply.  You're redirecting
> stdin,
> >>so user input would 
> >>be taken from there; you're redirecting stdout and
> >>stderr, so the prompt 
> >>won't be visible to the user.
> >>
> 
=== message truncated ===