Duncan Murdoch murdoch at stats.uwo.ca wrote:
> On 27/11/2009 3:36 PM, Alexander Søndergaard wrote:
> I'm new to R. Having a functional background, I was wondering what's
> the idiomatic way to iterate. It seems that for loops are the default
> given there's no tail-call optimization.
>
> I'm curious to know whether there is a way to transform the following
> toy snippet into something that doesn't eat up gigabytes of memory
> (like it's for loop counterpart) using laziness:
>
> Reduce('+', seq(1,1e6))
I believe the iterators and foreach packages give ways to iterate
without creating the whole array, so they might do what you want.
The OP may also be interested in the jit package, which currently
just covers (see http://www.milbo.users.sonic.net/ra) loops, but
might eventually extend to TCO.
David Duffy.
--
| David Duffy (MBBS PhD) ,-_|\
| email: dav...@qimr.edu.au ph: INT+61+7+3362-0217 fax: -0101 / *
| Epidemiology Unit, Queensland Institute of Medical Research \_,-._/
| 300 Herston Rd, Brisbane, Queensland 4029, Australia GPG 4D0B994A v
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