ok ok, I will RTFM :-) In fact:
> msd[13] - 0.17 [1] -2.775558e-17 and of course: > all.equal(msd[13],0.17) [1] TRUE it a precision problem :-) Sorry to bother you with this anyway should be FAQ 0.0. Davide On Feb 7, 2013, at 11:20 AM, Jari Oksanen wrote: > This should be FAQ 0.0. No other thing is asked as frequently as this. This > is the FAQest of all FAQs, and a mother of all FAQs. At least this should be > in R posting guide: "Read FAQ 7.31 before posting!" > > Cheers, Jari Oksanen > > On 07/02/2013, at 12:13 PM, R. Michael Weylandt wrote: > >> R FAQ 7.31 >> >> Cheers, >> MW >> >> On Thu, Feb 7, 2013 at 10:05 AM, Davide Rambaldi <davide.ramba...@ieo.eu> >> wrote: >>> Hello everybody: >>> >>> I get a strange behavior with seq, take a look at this: >>> >>>> msd <- seq(0.05,0.3, 0.01) >>>> msd[13] >>> [1] 0.17 >>>> class(msd) >>> [1] "numeric" >>>> class(msd[13]) >>> [1] "numeric" >>>> typeof(msd[13]) >>> [1] "double" >>> >>> now the problem: >>> >>>> msd[13] == 0.17 >>> [1] FALSE >>> >>> It is strange only to me? >>> >>> Consider that: >>> >>>> 0.17 == 0.17 >>> [1] TRUE >>> >>> and also >>> >>>> a <- c(0,1,0.17) >>>> a >>> [1] 0.00 1.00 0.17 >>>> a[3] == 0.17 >>> [1] TRUE >>> >>> It's a BUG in seq? I suspect something related to doubles >>> >>> sessionInfo(): >>> >>> R version 2.15.2 (2012-10-26) >>> Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit) >>> >>> locale: >>> [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8 >>> >>> attached base packages: >>> [1] stats graphics grDevices utils datasets methods base >>> >>> loaded via a namespace (and not attached): >>> [1] tools_2.15.2 >>> >>> >>> ----------------------------------------------------------- >>> PLEASE NOTE MY NEW EMAIL ADDRESS >>> ----------------------------------------------------------- >>> >>> ----------------------------------------------------- >>> Davide Rambaldi, PhD. >>> ----------------------------------------------------- >>> IEO ~ MolMed >>> [e] davide.ramba...@ieo.eu >>> [e] davide.ramba...@gmail.com >>> >>> ______________________________________________ >>> R-devel@r-project.org mailing list >>> https://stat.ethz.ch/mailman/listinfo/r-devel >> >> ______________________________________________ >> R-devel@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-devel > > -- > Jari Oksanen, Dept Biology, Univ Oulu, 90014 Finland > jari.oksa...@oulu.fi, Ph. +358 400 408593, http://cc.oulu.fi/~jarioksa > > > [[alternative HTML version deleted]]
______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
