Clark Johnston wrote: > Is there a way to create a new matrix from and existing matrix with > > A > [,1] [,2] > [1,] 1 13 > [2.] 2 18 > [3,] 3 14 > [4,] 4 20 > > if(A[,2] > 15) > > B > [,1] [,2] > [1,] 2 18 > [2,] 4 20 > > It's easiest to get help if you give your objects as the output from ?dput. This is just simple indexing: B <- A[A[, 2] > 15, ]