[R] speeding up functions for large datasets

Jean Eid jeaneid at chass.utoronto.ca
Fri Aug 6 12:47:04 CEST 2004

you might want to turn your data into a matrix. You get much much faster
for  loops doing that.


On Fri, 6 Aug 2004 Freja.Vamborg at astrazeneca.com wrote:

> Dear R-helpers,
> I'm dealing with large datasets, say tables of 60 000 times 12 or so, and
> some of the functions are (too ) slow and I'm therefore trying to find ways
> to speed them up.
> I've found that for instance for-loops are slow in R (both by testing and by
> searching through mail archives etc )
> Are there any more well known arguments that are slow in R, ,maybe at data
> representation level, code-writing, reading in the data.
> I've also tried incorporating C-code, which works well, but I'd also like to
> find other, maybe more "shortcut" ways.
> Thanks in advance,
> Freja!

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