isOpen() misbehaviour

Hello,
From the doc, it says:
"isOpen returns a logical value, whether the connection is currently open."

But actually it seems to die on closed connections:
con <- file()
isOpen(con)
[1] TRUE
close(con)
isOpen(con)
Error in isOpen(con) : invalid connection

Is it expected ?
Tested on R-3.0.2 and R version 3.1.0 Patched (2014-06-11 r65921) on
linux x86_64

Karl
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Thanks Joris, it makes sense now, though the doc is a bit misleading.
Hi Karl,

that is expected. The moment you close a connection, it is destroyed as well
(see ?close). A destroyed connection cannot be tested. In fact, I've used
isOpen() only in combination with the argument rw.

con <- file("clipboard",open="r")
isOpen(con,"write")
[1] FALSE

cheers

On Thu, Jun 19, 2014 at 3:10 PM, Karl Forner <karl.forner at gmail.com> wrote:
Hello,

From the doc, it says:
 "isOpen returns a logical value, whether the connection is currently
open."

But actually it seems to die on closed connections:
con <- file()
isOpen(con)
[1] TRUE
close(con)
isOpen(con)
Error in isOpen(con) : invalid connection

Is it expected ?
Tested on R-3.0.2 and R version 3.1.0 Patched (2014-06-11 r65921) on
linux x86_64

Karl

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Joris Meys
Statistical consultant

Ghent University
Faculty of Bioscience Engineering
Department of Mathematical Modelling, Statistics and Bio-Informatics

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