[R] tapply for function taking of >1 argument?

[sjaffe]

I'm sure I can put this together from the various 'apply's and split, but I
wonder if anyone has a quick incantation:

E.g. I can do tapply( data, groups, mean)

but how can I do something like:  tapply( list(data,weights), groups,
weighted.mean ) ?

(or: mapply is to sapply as ? is to tapply )

Thanks for your help.
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