R help - Feb 2023 - Removing variables from data frame with a wile card

On Sun, 12 Feb 2023 14:57:36 -0800
Jeff Newmiller <jdnewmil at dcn.davis.ca.us> wrote:
> x["V2"]
> 
> is more efficient than using drop=FALSE, and perfectly normal syntax
> (data frames are lists of columns).
<SNIP>

I never cease to be amazed by the sagacity and perspicacity of the
designers of R.  I  would have worried that x["V2"] would turn out to
be
a *list* (of length 1), but no, it retains the data.frame class, which
is clearly the Right Thing To Do.

cheers,

Rolf

-- 
Honorary Research Fellow
Department of Statistics
University of Auckland
Stats. Dep't. phone: +64-9-373-7599 ext. 89622
Home phone: +64-9-480-4619

x[?V2?] would retain columns of x headed by V2. What I need is the opposite??I
need a data grime with those columns excluded.

Steven from iPhone
> On Feb 13, 2023, at 9:33 AM, Rolf Turner <r.turner at auckland.ac.nz>
wrote:
> 
> ?
>> On Sun, 12 Feb 2023 14:57:36 -0800
>> Jeff Newmiller <jdnewmil at dcn.davis.ca.us> wrote:
>> 
>> x["V2"]
>> 
>> is more efficient than using drop=FALSE, and perfectly normal syntax
>> (data frames are lists of columns).
> 
> <SNIP>
> 
> I never cease to be amazed by the sagacity and perspicacity of the
> designers of R.  I  would have worried that x["V2"] would turn
out to be
> a *list* (of length 1), but no, it retains the data.frame class, which
> is clearly the Right Thing To Do.
> 
> cheers,
> 
> Rolf
> 
> -- 
> Honorary Research Fellow
> Department of Statistics
> University of Auckland
> Stats. Dep't. phone: +64-9-373-7599 ext. 89622
> Home phone: +64-9-480-4619
> 
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