On 2011-06-27 03:02, 新鼎-智慧製造事業處-鄭紹文 wrote:
Dear sir,
If I have a vector as:
y<- c(1:4)
and a matrix as:
x<- matrix (5:12, nrow=4, ncol=2)
Then I create a data frame as:
t<- data.frame(y, x)
R will generate a data frame of 3 columns
names(t)
"y" "X1" "X2"
is.vector(t$X1) returns TRUE
is
hi,
because of my ignorance I can't figure out why would you need such a structure.
However the following trick works:
> a <- matrix(1:6,3)
> b <- data.frame(1:3)
> b$a <- a
> b
X1.3 a.1 a.2
11 1 4
22 2 5
33 3 6
> names(b)
[1] "X1.3" "a"
> class(b$a)
[1] "matrix"
> is.mat
Dear sir,
If I have a vector as:
>y <- c(1:4)
and a matrix as:
>x <- matrix (5:12, nrow=4, ncol=2)
Then I create a data frame as:
>t <- data.frame(y, x)
R will generate a data frame of 3 columns
>names(t)
> "y" "X1" "X2"
>is.vector(t$X1) returns TRUE
> is.vector(t$X2) returns TRUE
R splits the
3 matches
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