[R] Removing variables from data frame with a wile card
jdnewm|| @end|ng |rom dcn@d@v|@@c@@u@
Mon Feb 13 03:51:58 CET 2023
x[ names( x ) != "V2" ]
x[ ! names( x ) %in% c( "V2", "V3" ) ]
or any other character or logical or integer expression that selects columns you want...
On February 12, 2023 6:38:00 PM PST, Steven Yen <styen using ntu.edu.tw> wrote:
>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 using auckland.ac.nz> wrote:
>>> On Sun, 12 Feb 2023 14:57:36 -0800
>>> Jeff Newmiller <jdnewmil using dcn.davis.ca.us> wrote:
>>> is more efficient than using drop=FALSE, and perfectly normal syntax
>>> (data frames are lists of columns).
>> 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.
>> 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
Sent from my phone. Please excuse my brevity.
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