Should have specified I only checked on Windows. So: On Windows 7 64bit, the R-32bit works fine, the R-64bit gives the behaviour Martyn reported.
Cheers Joris On Mon, Nov 21, 2011 at 3:58 PM, Brian G. Peterson <br...@braverock.com> wrote: > On Mon, 2011-11-21 at 14:41 +0000, Martyn Byng wrote: >> I'm getting some strange behaviour when trying to use the power >> operator >> (a^b) when a is large and b is less than one: >> >> big <- .Machine$double.xmax >> big >> big^0.5 >> sqrt(big) >> >> > big <- 1.797693134862315708384e+308 >> > big^0.5 >> [1] Inf >> > sqrt(big) >> [1] 1.340781e+154 >> >> >> I'm guessing that this behaviour is not expected, or am I missing >> something about ^? > > On a recent Ubuntu 64bit install with R2.14.0 from the repositories, I > get: > >> big <- .Machine$double.xmax >> big > [1] 1.797693e+308 >> big^0.5 > [1] 1.340781e+154 >> sqrt(big) > [1] 1.340781e+154 > > so it does seem to be specific either to your environment. > > -- > Brian G. Peterson > http://braverock.com/brian/ > Ph: 773-459-4973 > IM: bgpbraverock > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > -- Joris Meys Statistical consultant Ghent University Faculty of Bioscience Engineering Department of Mathematical Modelling, Statistics and Bio-Informatics tel : +32 9 264 59 87 joris.m...@ugent.be ------------------------------- Disclaimer : http://helpdesk.ugent.be/e-maildisclaimer.php ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
