On Fri, 8 Apr 2011, Joris Meys wrote:
Thx for the information. I read it, but I wasn't sure what was going
on inside.
Then perhaps you needed to do your homework: the references on the
help page would have explained it to you.
Is there a way to close a connection without destroying it?
Guess not, but you never know...
Not from R code.
Cheers
Joris
On Fri, Apr 8, 2011 at 5:09 PM, Duncan Murdoch <murdoch.dun...@gmail.com> wrote:
On 08/04/2011 10:56 AM, Joris Meys wrote:
Dear all,
I do not completely understand following behaviour :
con<- file("test.txt")
isOpen(con)
[1] FALSE
open(con)
isOpen(con)
[1] TRUE
close(con)
isOpen(con)
Error in isOpen(con) : invalid connection
str(con)
Classes 'file', 'connection' atomic [1:1] 3
..- attr(*, "conn_id")=<externalptr>
Why do I get an error, indicating an invalid connection, after I
closed a connection? Is this to be expected?
Quoting ?close: " ‘close’ closes and destroys a connection. " In the current
implementation, connections are a finite resource, and you need to be able
to get rid of them when you are done. close(con) is the way to do that. If
you want to re-open it, you need to remember the filename (or extract it
before calling close()), and issue another call to file().
Duncan Murdoch
--
Joris Meys
Statistical consultant
Ghent University
Faculty of Bioscience Engineering
Department of Applied mathematics, biometrics and process control
tel : +32 9 264 59 87
joris.m...@ugent.be
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