[R] Removing named objects using rm(..)

[Jeff Newmiller]

What about putting your objects in a list, which does not have the search through parents semantics?
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Sent from my phone. Please excuse my brevity.

Worik R <worikr at gmail.com> wrote:

>>
>> You may find it more reliable to define an environment in which you
>> will be storing your data (perhaps globalenv(), perhaps something
>created
>> by new.env())  and then testing for existence of a dataset by a given
>name
>> in that environment.
>>
>>
>I did that.
>
>PAIR.ENV <- new.env()
>....
>get("USDCHF", env=PAIR.ENV)
>
>returns trhe USDCHF defined in timeSeries
>
>This is very hard!
>
>Worik
>
>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 Worik R
>> > Sent: Monday, December 10, 2012 5:47 PM
>> > To: Duncan Murdoch
>> > Cc: r-help
>> > Subject: Re: [R] Removing named objects using rm(..)
>> >
>> > On Tue, Dec 11, 2012 at 2:27 PM, Duncan Murdoch
>> > <murdoch.duncan at gmail.com>wrote:
>> >
>> > > On 12-12-10 7:33 PM, Worik R wrote:
>> > >
>> > >> Let me restate my question.
>> > >>
>> > >> Is there a straightforward way of ensuring I can use the
>variable name
>> > >> USDCHF?
>> > >>
>> > >
>> > > You can use any legal variable name.  The only risk is that you
>will
>> > > overwrite some other variable that you created.  You can't
>overwrite
>> > > variables from packages.  (You might mask them, but they are
>still
>> > > accessible using the :: notation.  E.g. after you set
>> > >
>> > > USDCHF <- NULL
>> > >
>> >
>> > Exactly.  I got around this by assigning NULL to the variable names
>that
>> I
>> > would have deleted.  Then instead of testing for existence I tested
>for
>> > NULL.
>> >
>> >
>> > >
>> > > you can still access the one in timeSeries using
>> > >
>> > > timeSeries::USDCHF
>> >
>> >
>> > Christ.  That is what I wanted to delete.  I read the scoping
>section of
>> > R-Lang (again) and nothing  I could see prepared me for the shock
>of...
>> >
>> > > library(timeSeries)
>> > > nrow(USDCHF)
>> > [1] 62496
>> > > rm(USDCHF)
>> > Warning message:
>> > In rm(USDCHF) : object 'USDCHF' not found
>> > > nrow(USDCHF)
>> > [1] 62496
>> >
>> >
>> > The message from rm was that USDCHF did not exist.  But I can still
>> access
>> > its properties with nrow.
>> >
>> > This is very broken.  I would not have believed I would see that in
>the
>> > 21st century with a modern language.  (Oh wait, there is Javascript
>and
>> > PHP, so in comparison R is not that broken)
>> >
>> > I am not new to R, I have been (mis)using it for 5 years.  I love
>aspects
>> > of R, but this and a few other things (lack of debugging support
>and
>> > ignoring the "principle of least surprise" are two biggies) are
>very
>> > frustrating.  Without debugging support or more help from the
>compiler
>> > (like a "cannot rm EURCHF" message instead of a lie) R causes as
>many
>> > problems as it solves.
>> >
>> > Sigh.  Thanks for the help.
>> >
>> > Worik
>> >
>> >
>> >
>> >
>> > >
>> >
>> >       [[alternative HTML version deleted]]
>> >
>> > ______________________________________________
>> > R-help at r-project.org mailing list
>> > https://stat.ethz.ch/mailman/listinfo/r-help
>> > PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> > and provide commented, minimal, self-contained, reproducible code.
>>
>
>	[[alternative HTML version deleted]]
>
>______________________________________________
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>and provide commented, minimal, self-contained, reproducible code.