[R] trouble with data.matrix

Laurent Gautier
2001-10-27T13:06:08Z

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"



Reading the man page for 'data.matrix' trends to indicate it generates a
numerical matrix from a data.frame.
... or am I wrong ? (I could almost swear it was working before... but
like always the question turns to be
'before what ?'   =)    ).



Any hint would be greatly appreciated







...Oups, I almost forget:
I use R-1.3.1 compiled on a linux box with Suse 7.1






Laurent






--
Laurent Gautier			CBS, Building 208, DTU
PhD. Student			D-2800 Lyngby,Denmark
tel: +45 45 25 24 85		http://www.cbs.dtu.dk/laurent
-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !)  To: r-help-request at
stat.math.ethz.ch
_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._