matrixStats: Extend to arrays too (Was: Re: Suggestion: Adding quick rowMin and rowMax functions to base package)
A well-designed API generalized to work with arrays should probably borrow ideas from how argument 'MARGIN' of apply() works, how argument 'dim' in rowSums() for (though I must say the letter seem a bit ad hoc at first sight given the name of the function). ?There may also be something to learn from the 'reshape' package and so.
I'd also recommend looking at plyr::aaply, which fixes a few things that have always annoyed me about apply - namely that it is not idempotent/identical to aperm when the summary function is the identity. Hadley
Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice University http://had.co.nz/