Hi,
I want to construct a data.frame 'y' by using x$x and x$y. I think
that there might be better ways to do it (because, for example, we can
use a_matrix[3:5,] to extract certain rows, where 'a_matrix' is a
matrix). Can somebody let know what the best way is?
> a=data.frame(x=1:10,y=rep("abc",10),z=rep("xyz",10))
> a
x y z
1 1 abc xyz
2 2 abc xyz
3 3 abc xyz
4 4 abc xyz
5 5 abc xyz
6 6 abc xyz
7 7 abc xyz
8 8 abc xyz
9 9 abc xyz
10 10 abc xyz
> b=data.frame(x=a$x, y=a$y)
> b
x y
1 1 abc
2 2 abc
3 3 abc
4 4 abc
5 5 abc
6 6 abc
7 7 abc
8 8 abc
9 9 abc
10 10 abc
Regards,
Peng
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