[R] trouble with data.matrix
Laurent Gautier
laurent at genome.cbs.dtu.dk
Sat Oct 27 15:50:04 CEST 2001
On Sat, 27 Oct 2001, Martin Maechler wrote:
> >>>>> "Laurent" == Laurent Gautier <laurent at cbs.dtu.dk> writes:
>
> Laurent> Dear all, The following causes me trouble:
>
> > a <- data.frame(2:5,3:6,4:7)
>
> > str(a)
> `data.frame': 4 obs. of 3 variables:
> $ X2.5: int 2 3 4 5
> $ X3.6: int 3 4 5 6
> $ X4.7: int 4 5 6 7
>
> > str(data.matrix(a))
> int [1:4, 1:3] 2 3 4 5 3 4 5 6 4 5 ...
> - attr(*, "dimnames")=List of 2
> ..$ : chr [1:4] "1" "2" "3" "4"
> ..$ : chr [1:3] "X2.5" "X3.6" "X4.7"
>
> Laurent> Reading the man page for 'data.matrix' trends to indicate it
> Laurent> generates a numerical matrix from a data.frame.
>
> exactly --- and what is the trouble ?
Ouch...hhmmmm... I think I know: lack of sleep.....
> You *did* get a numerical matrix {integers are numeric}
I was looking the 'attribute' line... too stoopid....
Sorry for bothering (and eventually making a fool of myself)....
Laurent
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