[R] searching for a specific row name in R

[MacQueen, Don]

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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    ______________________________________________
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