I have a hundred identifier names that I want to check from the second column of a matrix with 6000 entries in the column. Instead of using R > c("d", "v", "4", "s") %in% letters , is there an alternative?
I have the hundred identifier names that are of my interest stored in an array. On Tue, Aug 14, 2018 at 9:16 AM, Boris Steipe <boris.ste...@utoronto.ca> wrote: > 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. > > [[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.