On 7 April 2010 16:12, Steve Lianoglou <mailinglist.honey...@gmail.com> wrote: > Hi, > > On Wed, Apr 7, 2010 at 5:44 PM, Robin Evans <rj...@stat.washington.edu> wrote: >> Dear all, >> >> I'm wondering if there exist vectorized forms of 'isTRUE()', >> 'identical()' and 'all.equal()'. My problem is that I wish to test if >> each element of a vector is equal to a particular value (or >> numerically close), whilst dealing carefully with NAs and so on. >> However, using sapply() with identical() is very slow because it makes >> so many separate function calls: >> >> x = rbinom(1e4, 1, 0.5) >> >> system.time(sapply(x, function(x) isTRUE(all.equal(x, 0)))) >> >> system.time(abs(x) < .Machine$double.eps^0.5) >> >> The latter version is fast, but potentially dangerous. Any suggestions? > > Why is it dangerous? Because some values in x can be NA? > Precisely - I would like all the answers to be TRUE or FALSE.
Rob -- Robin Evans Statistics Department University of Washington www.stat.washington.edu/~rje42 ______________________________________________ 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.
