R help - Jul 2009 - From xtabs to matrix

Hi list,
is it possible convert the xtabs result 
xtabs(breaks~tension+wool,data=warpbreaks)

       wool
tension   A   B
      L 401 254
      M 216 259
      H 221 169

to a simple matrix or data frame?
           A   B
      L 401 254
      M 216 259
      H 221 169


Thanks a lot! Gianandrea
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glaporta wrote:
> Hi list,
> is it possible convert the xtabs result 
> xtabs(breaks~tension+wool,data=warpbreaks)
> 
>        wool
> tension   A   B
>       L 401 254
>       M 216 259
>       H 221 169
> 
> to a simple matrix?
>            A   B
>       L 401 254
>       M 216 259
>       H 221 169

In principle it already is a matrix that is declared to be of some class 
and has a call attribute. If you cannot use it as a matrix somehwre, 
which I can as in

  temp <- xtabs(breaks ~ tension + wool, data = warpbreaks)
  t(temp) %*% temp


one way to remove the additional attributed is to say

attr(temp, "class") <- NULL
attr(temp, "call") <- NULL

for example.

Uwe Ligges




> 
> Thanks a lot! Gianandrea