[R] closing file with close(file) *silently*

[Prof Brian Ripley]

On 06/03/2012 17:53, Federico Calboli wrote:
> Hi All,
>
> I am writing a function that reads a file in
>
> myfile = file('myfile.raw', 'rb')
> .
> .
> .
> .
> .
> close(myfile)
>
> No matter what, I get the warning
>
> Warning message:
> closing unused connection 3 (myfile.raw)
>
> Since the whole thing is in a function, I'd like to avoid unecessary noise for the user, and I'd like to kill the warning -- without having to mess with global options.
>
> Any ideas how?

Make sure the connection (not 'file') is really closed.  That message 
indicates that close(myfile) was never called.

A good way to do this is to use on.exit() in your function.

> BW
>
> F
>
>
>
> --
> Federico C. F. Calboli
> Neuroepidemiology and Ageing Research
> Imperial College, St. Mary's Campus
> Norfolk Place, London W2 1PG
>
> Tel +44 (0)20 75941602   Fax +44 (0)20 75943193
>
> f.calboli [.a.t] imperial.ac.uk
> f.calboli [.a.t] gmail.com
>
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

Hmm, how long have you been asking questions here?  Following the 
posting guide is way overdue.  We should not have to guess what error 
you made in the code you failed to show us.