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, Micha
Read ?data.frame
In particular, notice the check.names argument.
On December 9, 2018 7:11:52 AM PST, Michael Dewey
wrote:
>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
Your names are not syntactically valid.
Consider:
> mat <- matrix(1:9, nrow = 3)
> colnames(mat) <- letters[1:3]
> mat
a b c
[1,] 1 4 7
[2,] 2 5 8
[3,] 3 6 9
> data.frame(x=1:3,mat)
x a b c
1 1 1 4 7
2 2 2 5 8
3 3 3 6 9
See ?make.names, and the "Value" section of ?data.frame for how names
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 = "
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.
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