[R] searching for a specific row name in R

[Bert Gunter]

These seem to be basic R questions. You should spend time with an R
tutorial or two for this sort of thing. This list is here to help, but you
also need to do homework on your own if you have not already done so.

Cheers,
Bert






Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )

On Mon, Aug 13, 2018 at 8:36 PM, Deepa <deepamahm.iisc using 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 <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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> >     > and provide commented, minimal, self-contained, reproducible code.
> >
> >     ______________________________________________
> >     R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> >
> >
> >
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help using 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.
>

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