R help - Feb 2009 - meaning of warning messages

Hi all,

Read a string of data and had this message during a plot run.

Warning message:
closing unused connection 3 (Lines)

Not sure what this means or if it should be of concern.

Tnx.

On Mon, 9 Feb 2009, Neotropical bat risk assessments wrote:
> Hi all,
>
> Read a string of data and had this message during a plot run.
>
> Warning message:
> closing unused connection 3 (Lines)
>
> Not sure what this means or if it should be of concern.
It means R tidied up after you.  But it may have tidied up things you 
dropped by mistake, hence the warning.

Without a full example (see the footer of this message) we cannot tell 
what you (or a package you are using) did wrong.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  stats.ox.ac.uk/~ripley
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

On Mon, Feb 9, 2009 at 12:36 PM, Neotropical bat risk assessments <
neotropical.bats@gmail.com> wrote:
> Read a string of data and had this message during a plot run.
>
> Warning message:
> closing unused connection 3 (Lines)
>
> Not sure what this means or if it should be of concern.
>
This simply means that a file/database handle has been garbage collected
because it has become inaccessible, a perfectly normal and innocuous event.
For example:
> fff <- file("/tmp")  # open a file
> fff <- NULL          # it is now inaccessible through fff
> gc()
         used (Mb) gc trigger (Mb) max used (Mb)
Ncells 106619  2.9     350000  9.4   350000  9.4
Vcells  74987  0.6     786432  6.0   353825  2.7
Warning message:
closing unused connection 3 (/tmp)                 <<<
file("/tmp") is no
longer available

I don't know why R considers this a "warning", or for that matter
why it
prints a notification at all with gcinfo(FALSE).  Of course, it is possible
to inadvertently make a file inaccessible, but then it is also possible to
inadvertently make important data inaccessible, and of course that is not
signalled.

             -s

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