On 12/09/2008, at 2:34 PM, Matthew Pettis wrote:
Hi,
Coming to R from SAS...
I have a data.frame A with 2 long factors "x" and "y". I want to get
a count of the number of rows with each level of "x" and "y" jointly.
'table' seemed like it would work, but as I have many levels, the
matrix output is pretty useless to me (and I don't care about zero
values). How can I get output that looks like:
A$x A$y Freq
------ ----- -------
x1 y1 8
x1 y3 10
...
as.data.frame(with(A,table(x,y)))
cheers,
Rolf Turner
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