On Sat, Jan 03, 2009 at 06:59:29PM +0100, Stefan Grosse wrote:
> On Sat, 3 Jan 2009 22:25:38 +0530 Ajay Shah <ajays...@mayin.org> wrote:
>
> AS> system.time(for (i in 1:10000000) {a[i] <- a[i] + 1})
>
> AS> I wonder what we're doing wrong!
>
> it is no secret that R does badly with loops. Thats why it is
> recommended to use vectorized operations.
But there's a big difference even on the vectorised version: a <- a +
1. Why should that be? Both systems should merely be handing down to
the BLAS. The (stock) R install has a less carefully setup BLAS as
compared with the (stock) matlab install?
--
Ajay Shah http://www.mayin.org/ajayshah
ajays...@mayin.org http://ajayshahblog.blogspot.com
<*(:-? - wizard who doesn't know the answer.
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