Hello, Today I happened to notice a strange error in R. If you type (2.01-0.06)==1.95, output from R is “FALSE”, which is wrong. But if you type (1.01-0.06)==0.95, output is “TRUE”, which is correct. I tested this in two systems: R 3.3.2 in my iMac and R 3.2.0 on my school’s Linux server. Both gave same outputs. As shown in the following:
> 2.01-0.06 [1] 1.95 > (2.01-0.06)==1.95 # should be TRUE; output is wrong [1] FALSE > 1.01-0.06 [1] 0.95 > (1.01-0.06)==0.95 # should be TRUE; output is correct [1] TRUE > (2.01-0.06)>1.95 # should be FALSE; output is correct [1] FALSE > (2.01-0.06)<1.95 # should be FALSE; output is wrong [1] TRUE Similar errors could be found with simple alterations of the above inputs, such as: > 5.533-5.412 [1] 0.121 > (5.533-5.412)==0.121 # should be TRUE; output is wrong [1] FALSE > 2.533-2.412 [1] 0.121 > (2.533-2.412)==0.121 # should be TRUE; output is correct [1] TRUE Could any of you test whether you have same outputs as mine? And does anyone know what is wrong with these? My guess is that R has a bug in processing double numbers. Thanks! TZ ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
