Select rows of a matrix that meet a condition

Question

In R with a matrix:

     one two three four
 [1,]   1   6    11   16
 [2,]   2   7    12   17
 [3,]   3   8    11   18
 [4,]   4   9    11   19
 [5,]   5  10         


        

Answer 1

If your matrix is called m, just use :

R> m[m$three == 11, ]