[EMAIL PROTECTED] writes: > Full_Name: Dong-Yun Kim > Version: 1.7.0/1.8.1 > OS: WinMe/WinXP > Submission from: (NULL) (4.33.147.192) > > > Hi all, > > It appears that R has a problem with evaluating logical "==" operator. The > following are a few examples I found: > > > 2.1+0.2==2.3 > [1] FALSE > > 2.7+0.1==2.8 > [1] FALSE > > 2.7+0.2==2.9 > [1] FALSE > > 3.1+0.2==3.3 > [1] FALSE > > Thanks. > > Dong-Yun Kim
Please, do read up on elementary computer theory, in particular the parts about inexact representation of decimal numbers as floating point numbers, and why equality of such numbers cannot be trusted! What you're seeing is the moral equivalent of 1/3 + 1/6 = 0.333 + 0.666 = 0.999 != 1 -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-devel
