Hello,
cbind alone will return a matrix, cbind.data.frame is probably what the
OP wants.
class(cbind(x = 1:3, mat))
#[1] "matrix"
cbind.data.frame(x = 1:3, mat)
# x (1) (2) (3)
#1 1 1 4 7
#2 2 2 5 8
#3 3 3 6 9
Hope this helps,
Rui Barradas
Às 15:11 de 09/12/2018, Michael Dewey escreveu:
Dear Jinsong
Try cbind(x = 1:3, mat)
and see if that helps
Michael
On 09/12/2018 15:05, Jinsong Zhao wrote:
Hi there,
In the following mini-example, I hope to keep the column names of mat,
but failed.
# mini-example
mat <- matrix(1:9, nrow = 3)
colnames(mat) <- paste("(", 1:3, ")", sep = "")
mat
(1) (2) (3)
[1,] 1 4 7
[2,] 2 5 8
[3,] 3 6 9
data.frame(x = 1:3, mat)
x X.1. X.2. X.3.
1 1 1 4 7
2 2 2 5 8
3 3 3 6 9
Any hints will be really appreciated.
Best,
Jinsong
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