On Thu, 2009-02-12 at 09:42 -0500, Stavros Macrakis wrote: > On Thu, Feb 12, 2009 at 4:28 AM, Gavin Simpson <gavin.simp...@ucl.ac.uk> > wrote: > > When I'm testing the speed of things like this (that are in and of > > themselves > > very quick) for situations where it may matter, I wrap the function call in > > a call > > to replicate(): > > > > system.time(replicate(1000, svd(Mean_svd_data))) > > > > to run it 1000 times, and that allows me to judge how quickly the > > function executes. > > I do the same, but with a small twist: > > system.time(replicate(1000, {svd(Mean_svd_data); 0} )) > > This allows the values of svd(...) to be garbage collected. > > If you don't do this and the output of the timed code is large, you > may allocate large amounts of memory (which may influence your timing > results) or run out of memory (which will also influence your timing > results :-) ),
Thanks for that tip Stavros. I hadn't realised that. G -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Dr. Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/ UK. WC1E 6BT. [w] http://www.freshwaters.org.uk %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% ______________________________________________ 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.