Use the %in% operator:
help('%in%')
e.g.
R > c("d", "v", "4", "s") %in% letters
[1] TRUE TRUE FALSE TRUE
B.
> On 2018-08-13, at 23:36, Deepa <deepamahm.i...@gmail.com> wrote:
>
> Hi Don,
>
> When there is a list of identifier names that I want to check, the only way
> is to loop over each entry stored in the list of identifier names or is
> there is there any other shortcut?
>
> Many thanks for the response?
>
> On Mon, Aug 13, 2018 at 8:18 PM, MacQueen, Don <macque...@llnl.gov> wrote:
>
>> Or to return a logical value, i.e., TRUE if the column contains the value,
>> FALSE if it does not:
>>
>> any( x[,2] == 'A501' )
>>
>> -Don
>> --
>> Don MacQueen
>> Lawrence Livermore National Laboratory
>> 7000 East Ave., L-627
>> Livermore, CA 94550
>> 925-423-1062
>> Lab cell 925-724-7509
>>
>>
>>
>> On 8/13/18, 12:09 AM, "R-help on behalf of Albrecht Kauffmann" <
>> r-help-boun...@r-project.org on behalf of alkau...@fastmail.fm> wrote:
>>
>> Hello Deepa,
>>
>> sum(x[,2] == "A501")
>> or
>> which(x[,2] == "A501")
>> .
>> Best,
>> Albrecht
>>
>>
>> --
>> Albrecht Kauffmann
>> alkau...@fastmail.fm
>>
>> Am Mo, 13. Aug 2018, um 07:10, schrieb Deepa Maheshvare:
>>> Hello Everyone,
>>>
>>> I have a 1000 x 20 matrix. The second column of the matrix has the
>> names
>>> of identifiers. How do I check when a certain identifier is present
>> in
>>> the set of 1000 identifier names present in the second column. For
>>> instance, let the names of identifiers be A1,A2,...A1000. I want to
>>> check whether A501 is present .How can this be checked?
>>>
>>> Any help will be highly appreciated.
>>>
>>>
>>> [[alternative HTML version deleted]]
>>>
>>> ______________________________________________
>>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>>> 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.
>>
>> ______________________________________________
>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> 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]]
>
> ______________________________________________
> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
______________________________________________
R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
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.
