Grokbase Groups R r-help October 2001
FAQ

On Sat, 27 Oct 2001, Martin Maechler wrote:

"Laurent" == Laurent Gautier <laurent@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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