[R] Warning message about closing a connection XXXX

[William Dunlap]

Re
  > How can I avoid the warning message altogether?
  
  ?closeAllConnections

I think of calls to closeAllConnections() in the same
way that I think of calls to rm(list=objects()):
they both can remove things that are not theirs to remove.

Calling gc() will close all unused connections, so
no damage can be done.  (I thought that the warning
about closing unused text connections was dropped in
a recent release of R so neither is really needed.)

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
 
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of David Winsemius
> Sent: Wednesday, January 04, 2012 7:10 AM
> To: Dan Abner
> Cc: r-help at r-project.org
> Subject: Re: [R] Warning message about closing a connection XXXX
> 
> 
> On Jan 4, 2012, at 9:53 AM, Dan Abner wrote:
> 
> > Hello everyone,
> >
> > After running the following code, I obtain this error message.
> >
> >
> >> mydata <- read.table(textConnection(mystring),
> > +    header=TRUE, sep=",",
> > +    row.names="id", na.strings=" ")
> >> mydata
> > Warning message:
> > closing unused connection 3 (mystring)
> >
> > =====
> >
> > However, when I attempt to run read.table() again and immediately
> > submit
> > the close() function (below), I obtain this message:
> >
> >> close(mystring)
> > Error in UseMethod("close") :
> >  no applicable method for 'close' applied to an object of class
> > "character"
> > =====
> >
> > How can I avoid the warning message altogether?
> 
> ?closeAllConnections
> 
> The error message occurs because "mystring was never the connection
> name.
> 
> --
> 
> David Winsemius, MD
> West Hartford, CT
> 
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