Re: [R] efficiency & profiling?

From: Duncan Murdoch <murdoch_at_stats.uwo.ca>
Date: Wed, 30 Apr 2008 19:33:26 -0400

On 30/04/2008 6:59 PM, esmail bonakdarian wrote:
> This has been an interesting discussion, and brings up two questions
> for me:
>
> Is there a good collection of hints/suggestions for R language idoms in terms
> of efficiency? For instance I read not to use for-loops, so I used apply only to
> later read that "apply" is internally implemented as a "for" so nothing gained

> here. Warnings about pitfalls (such as nested loops), hints, suggestions would
> be great.
>
> The second question - is there some sort of profiling tool available that would
> make it easy to recognize where the script is spending most of its time? Might
> be especially useful for newbies like me.

See ?Rprof for the tool. For the tips, I think you just need to hang around here a while. I don't know of a nice collection (but I'm sure there are several.)

Duncan Murdoch



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