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, ]
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