Simon, I never thought that this issue would be so complicated! So if I understand well, I should try both and see which one is better for my use. Am I right?
But as I said, except for a few specific tasks, speed should not be a problem for me. Thanks again for your detailed answers. Ivan Le 13 mars 2010 à 18:37, Simon Urbanek a écrit : > Ivan, > > On Mar 13, 2010, at 7:04 AM, Ivan Calandra wrote: > >> Dear Mac Users, >> >> New on R Mac (MacOS X 10.6), I've used up to now R.app [R.app GUI 1.31 >> (5537) i386-apple-darwin9.8.0]. >> But I've tried R64 [R.app GUI 1.31 (5537) x86_64-apple-darwin9.8.0] and it >> also works. >> >> If both work, which one should I use? Is there any difference in terms of >> speed for example (which would not be really critical for me since I don't >> really handle large datasets) or anything else. >> > > There is no clear answer to that. In general, using 32-bit R is a bit safer > because not all packages support 64-bit. The main advantage of 64-bit is that > you can use more memory (>4GB). Historically, 64-bit R was used only on > machines a lot of RAM. As of speed, on the one hand 64-bit instruction set is > faster as it can take advantage of new features, but on the other hand it > uses twice as much memory for pointers which is slows it down. I have posted > some info on the list here a while ago > http://www.mail-archive.com/r-sig-mac@stat.math.ethz.ch/msg04244.html > there is no clear winner - there are tasks where one is faster than the other > either way. > > In OS X 10.6 all applications are now by default 64-bit so in fact the > command line R is 64-bit so Apple's suggestion is to use the R64.app in Snow > Leopard -- but it's more about technology than real benefits I think... > > Cheers, > Simon > > -- Ivan CALANDRA PhD Student University of Hamburg Biozentrum Grindel und Zoologisches Institut und Museum Martin-Luther-King-Platz 3 D-20146 Hamburg, GERMANY +49(0)40 42838 6231 ivan.calan...@uni-hamburg.de ********** http://www.for771.uni-bonn.de http://webapp5.rrz.uni-hamburg.de/mammals/eng/mitarbeiter.php _______________________________________________ R-SIG-Mac mailing list R-SIG-Mac@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-mac