[R] searching for a specific row name in R

[Deepa]

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 <macqueen1 using 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-bounces using r-project.org on behalf of alkauffm using fastmail.fm> wrote:
>
>     Hello Deepa,
>
>     sum(x[,2] == "A501")
>     or
>     which(x[,2] == "A501")
>     .
>     Best,
>     Albrecht
>
>
>     --
>       Albrecht Kauffmann
>       alkauffm using 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]]
>     >
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>     ______________________________________________
>     R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
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>     and provide commented, minimal, self-contained, reproducible code.
>
>
>

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