[R] avoiding too many loops - reshaping data

Hadley Wickham hadley at rice.edu
Thu Nov 4 15:07:38 CET 2010

> Beware of facile comparisons of this sort -- they may be apples and nematodes.

And they also imply that the main time sink is the computation.  In my
experience, figuring out how to solve the problem using takes
considerably more time than 18 / 1000 seconds, and so investing your
energy in learning idioms that apply in a wide range of situations is
far more useful than figuring out the fastest solution to a single


Assistant Professor / Dobelman Family Junior Chair
Department of Statistics / Rice University

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