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.
