Hi
[email protected] napsal dne 17.09.2009 04:14:24:
> 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
what is wrong on
b[1:2,]
Regards
Petr
> 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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> and provide commented, minimal, self-contained, reproducible code.
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