[R] deleting column from data frame

[Benilton Carvalho]

i'd use:

test[["Y"]] <- NULL

b

On Tue, Feb 23, 2010 at 4:13 PM, adam naples <adam.naples at yale.edu> wrote:
> try
>
> test <- subset(test, select = -c(Y))
>
> The key is the  minus sign before c() in the select argument.
> You can put in as many columns as you like.
> -a
>
> On Feb 23, 2010, at 11:02 AM, David Winsemius wrote:
>
>>
>> On Feb 23, 2010, at 6:04 AM, Knut Krueger wrote:
>>
>>> Hi to all,
>>> test <- data.frame("X"=c(1:4),"Y"=c(5:8),"Z"=c(8:11))
>>> test <- test[,-2]
>>>
>>> Is there a way to specify the col name  "Y" to delete instead the number?
>>>
>>
>> I believe that negative indexing only works with numeric arguments. You could dummy up a negation approach for character vectors with:
>>
>> > test[, !(names(test) %in% c("Y"))]   #non-negated logical vector to index
>>  X  Z
>> 1 1  8
>> 2 2  9
>> 3 3 10
>> 4 4 11
>>
>> > test[, -grep("Y",names(test))]  # negated numeric vector to index
>>  X  Z
>> 1 1  8
>> 2 2  9
>> 3 3 10
>> 4 4 11
>>
>> --
>> David
>>> Kind regards Knut
>>>
>>> ______________________________________________
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>>
>> ______________________________________________
>> 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.
>
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>
> ______________________________________________
> 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.
>