[R] trouble with data.matrix

[Laurent Gautier]

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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