Yes, everyone will agree "7" is an integer, but I don't think computers will agree too :-) R thinks it's a double-precision number, except when you explicitly specify it as an integer (say, as.integer()).
> class(7) [1] "numeric" > is.double(7) [1] TRUE Regards, Yihui -- Yihui Xie <[EMAIL PROTECTED]> Phone: +86-(0)10-82509086 Fax: +86-(0)10-82509086 Mobile: +86-15810805877 Homepage: http://www.yihui.name School of Statistics, Room 1037, Mingde Main Building, Renmin University of China, Beijing, 100872, China On Wed, Sep 24, 2008 at 12:40 PM, <[EMAIL PROTECTED]> wrote: > Hi R users > Is there anything wrong in "is" function? (R 2.7.2) > I believe that everyone will agree that "7" is an integer, right? but why R > shows 7 is not an integer > >> is.integer(7) > > [1] FALSE >> >> is(7,"integer") > > [1] FALSE >> >> is(as.integer(7), "integer") > > [1] TRUE > > Thank you very much in advance > Chunhao > > ______________________________________________ > 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. > ______________________________________________ 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.
