[R] tapply slow?

Thomas Lumley tlumley at u.washington.edu
Wed Jul 24 17:28:27 CEST 2002

On Wed, 24 Jul 2002, Meinhard Ploner wrote:

> If I call the function tapply
> tapply(x, fact, sum)
> with arguments of length 500000 the function works very slow.
> Is there an alternative to get the same results?
> The factor has about 100000 levels.

Yes. rowsum().


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