Definitely a Fortune. John Kane Kingston ON Canada
> -----Original Message----- > From: rai...@krugs.de > Sent: Thu, 26 Sep 2013 11:30:27 +0200 > To: r-h...@stat.math.ethz.ch > Subject: Re: [R] Why does sin(pi) not return 0? > > (Ted Harding) <ted.hard...@wlandres.net> writes: > >> On 26-Sep-2013 07:55:38 Rolf Turner wrote: >>> On 09/26/13 19:31, Babak Bastan wrote: >>>> Hi experts, >>>> >>>> If I test sin(pi) in r, it returns me 1.224606e-16 >>>> >>>> Why doesn't return me 0? >>> > > I think this should be a Fortune: > ,---- > | >> If you think that 1.224606e-16 is different from 0, you should > probably not > | >> be using computers. > | > > | > Is that a Fortune? And, if so, should R be using computers? > | > > | > sin(pi) > | > # [1] 1.224606e-16 > | > sin(pi)==0 > | > # [1] FALSE > `---- > > Cheers, > > Rainer > >> >>> See FAQ 7.31 (which is in a way about the inverse of >>> your question, but it should provide the necessary insight). >>> >>> cheers, >>> Rolf Turner >> >> Though, mind you, FAQ 3.71 does also offer some consolation to R: >> >> all.equal(0,sin(pi)) >> # [1] TRUE >> >> So it depends on what you mean by "different from". Computers >> have their own fuzzy concept of this ... Babak has too fussy >> a concept. >> >> Ted. >> >> ------------------------------------------------- >> E-Mail: (Ted Harding) <ted.hard...@wlandres.net> >> Date: 26-Sep-2013 Time: 09:13:33 >> This message was sent by XFMail >> > <#secure method=pgpmime mode=sign> > > -- > Rainer M. Krug > > email: RMKrug<at>gmail<dot>com > > ______________________________________________ > 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. ____________________________________________________________ FREE ONLINE PHOTOSHARING - Share your photos online with your friends and family! Visit http://www.inbox.com/photosharing to find out more! ______________________________________________ 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.
