[R] tapply slow?

[Thomas Lumley]

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().

	-thomas

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