on 07/26/2008 10:16 AM ascentnet wrote:
I know there is a very simple answer to this question, but it eludes me. I
need to insert a vector into a matrix. So if I have a 2 column matrix with
5 rows, I need to insert in an additional vector so there is now 6 rows
without overwriting any of the data in the matrix already.
thanks,
Ben.
See ?rbind
mat <- matrix(1:10, ncol = 2)
> mat
[,1] [,2]
[1,] 1 6
[2,] 2 7
[3,] 3 8
[4,] 4 9
[5,] 5 10
Add the row to the end:
> rbind(mat, c(6, 11))
[,1] [,2]
[1,] 1 6
[2,] 2 7
[3,] 3 8
[4,] 4 9
[5,] 5 10
[6,] 6 11
Insert the row before the 5th row:
> rbind(mat[1:4, ], c(6, 11), mat[5, ])
[,1] [,2]
[1,] 1 6
[2,] 2 7
[3,] 3 8
[4,] 4 9
[5,] 6 11
[6,] 5 10
HTH,
Marc Schwartz
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