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Multiple count if style "queries"

Chris,

Something like this should do the job:

1.
rowSums(xtabs(~ ECO_NAME + Genus, x) > 0)
2.
rowSums(xtabs(~ ECO_NAME + Genus, x))

Cheers,

Peter
On Fri, May 20, 2011 at 3:19 PM, Chris Mcowen <chrismcowen at gmail.com> wrote: