Re: [R] efficiency profiling?
esmail bonakdarian [EMAIL PROTECTED] wrote: Yes, I have been reading the list, the amount of messages per day is simply amazing, I can hardly keep up. Do most of you read this on the web or get it as digest? I am getting them as individual e-mails (thank god for filters) ... :-) I used filters for a while. Now, I read the R list through the gmane Usenet interface. It appears to me to be a newsgroup, rather than a huge collection of emails. I find that much easier. See http://gmane.org/ -- Mike Prager, NOAA, Beaufort, NC * Opinions expressed are personal and not represented otherwise. * Any use of tradenames does not constitute a NOAA endorsement. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] efficiency profiling? (was: Why R is 200 times slower than Matlab ?)
On Wed, Apr 30, 2008 at 06:59:38PM -0400, 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.
Personally i like {l,t,}apply better, 1) it is more readable,
2) it takes two minutes to change it to par{L,S,}apply and then
it runs in parallel.
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
G.
[...]
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Re: [R] efficiency profiling?
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 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] efficiency profiling?
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 Hi, thanks .. several folks pointed me to Rprof, I'll take a look. Yes, I have been reading the list, the amount of messages per day is simply amazing, I can hardly keep up. Do most of you read this on the web or get it as digest? I am getting them as individual e-mails (thank god for filters) ... :-) Esmail _ Back to work after babyhow do you know when youre ready? 5797498ocid=T067MSN40A0701A [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] efficiency profiling?
On 30/04/2008 7:47 PM, esmail bonakdarian wrote: 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 Hi, thanks .. several folks pointed me to Rprof, I'll take a look. Yes, I have been reading the list, the amount of messages per day is simply amazing, I can hardly keep up. Do most of you read this on the web or get it as digest? I am getting them as individual e-mails (thank god for filters) ... :-) I think most read as email, but a substantial minority read it on the web. You really do need filters. Personally, I scan the subject lines, and read about 1 in 10 threads. Duncan Murdoch __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] efficiency profiling?
On Wed, Apr 30, 2008 at 4:33 PM, Duncan Murdoch [EMAIL PROTECTED] wrote: On 30/04/2008 6:59 PM, esmail bonakdarian wrote: snip Is there a good collection of hints/suggestions for R language idoms in terms of efficiency? snip 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 ;-) here's one: https://stat.ethz.ch/pipermail/r-help/2005-October/080991.html Kingsford Jones __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
