Further and last trial: > a=5.102> a-floor(a)==0[1] FALSE> a=5.9> a-floor(a)==0[1] FALSE> a=19> > a-floor(a)==0[1] TRUE
All the best, Sergio 2014-10-18 16:25 GMT+02:00 PO SU <rhelpmaill...@163.com>: > > It's due to that, 1 is a numeric, 1.2 is a numeric, though it's true. but > deeply, when i want to know 1 is an integer, there seems no easy way to > get the answer. > So, is there anyone happen to know it? > > > > > -- > > PO SU > mail: desolato...@163.com > Majored in Statistics from SJTU > > > > At 2014-10-18 20:10:09, "S Ellison" <s.elli...@lgcgroup.com> wrote: > >> But i use a<-10/b , b is some value ,may be 5, maybe 5.5 > >If you do floating point arithmetic on integers you'll usually get > floating point answers, including the 5.0. > > > >See FAQ 7.31 for the usual floating point problem, and ?all.equal for the > usual answer to it. You could see if a result is close to an integer by,for > example, using all.equal to compare it to itself after rounding. > > > >S > > > >******************************************************************* > >This email and any attachments are confidential. Any use, copying or > >disclosure other than by the intended recipient is unauthorised. If > >you have received this message in error, please notify the sender > >immediately via +44(0)20 8943 7000 or notify postmas...@lgcgroup.com > >and delete this message and any copies from your computer and network. > >LGC Limited. Registered in England 2991879. > >Registered office: Queens Road, Teddington, Middlesex, TW11 0LY, UK > ______________________________________________ > 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. > [[alternative HTML version deleted]] ______________________________________________ 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.
