On 19-03-2012, at 13:47, Dajiang Liu wrote: > > Thanks a lot for the clarification. I just find it very bizarre that if you > run a=0.1*(1:9);which(a==0.4) > it returns the right answer. Anyway, I will pay attention next time. Thanks a > lot. >
Look at > a = 0.1*(1:4) > a - 0.4 [1] -0.3 -0.2 -0.1 0.0 > Berend >> Date: Mon, 19 Mar 2012 08:59:59 +0100 >> From: rainer.schuerm...@gmx.net >> Subject: Re: [R] a very simple question >> To: ldjst...@hotmail.com; r-help@r-project.org >> >> As to the reasons, David as given you the necessary hints. >> >> In order to get around the issue, here is what I do: >> >>> a <- round( 0.1 * ( 1:9 ), 1 ) >>> a >> [1] 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 >>> which( a == 0.3 ) >> [1] 3 >> >> Rgds, >> Rainer >> >> >> -------- Original-Nachricht -------- >>> Datum: Sun, 18 Mar 2012 21:43:54 +0000 >>> Von: Dajiang Liu <ldjst...@hotmail.com> >>> An: r-help@r-project.org >>> Betreff: [R] a very simple question >> >>> >>> Dear All, >>> I have a seemingly very simple question, but I just cannot figure out the >>> answer. I attempted to run the following:a=0.1*(1:9);which(a==0.3);it >>> returns integer(0). But obviously, the third element of a is equal to 0.3. >>> I must have missed something. Can someone kindly explain why? Thanks a >>> lot. >>> Regards,Dajiang >>> >>> [[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. >> >> -- >> ------- >> >> Gentoo Linux with KDE >> > > [[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. ______________________________________________ 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.
