[Rd] Invalid connection after closing?

From: Joris Meys <jorismeys_at_gmail.com>
Date: Fri, 08 Apr 2011 16:56:16 +0200


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? Cheers
Joris

-- 
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.Meys_at_Ugent.be
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