[R] "untable" function

[RINNER Heinrich]

Dear R-users!

I am using R1.2.0 under Windows NT4.0, and have data of the following form:

> #simple example of data structure:
> x <- data.frame(group=LETTERS[1:3], class1=1:3, class2=4:6)
> x
  group class1 class2
1     A      1        4
2     B      2        5
3     C      3        6

I would like to convert this to a data.frame y of the following form:
> y
 group class counts
1       A  class1  1
2       A  class2  4
3       B  class1  2
4       B  class2  5
5       C  class1  3
6       C  class2  6

So what I'm looking for is something like an "untable"-function. Is there a
simple "natural" way for this in R, or will I have to loop through rows and
columns somehow (my "real world" data set consists of 279 rows/groups and
100 columns/classes)?

Heinrich.
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