On Wed, 2006-07-26 at 18:35 -0700, Vries, Han de wrote: > seq(0.1, 0.9 - 0.8, by = 0.1) gives the following error message: > > Error in seq.default(0.1, 0.9 - 0.8, by = 0.1) : > wrong sign in 'by' argument > > but seq(0.1, 0.8 - 0.7, by = 0.1) gives > [1] 0.1 > (no error message) > > Why do I get an error message in the first case? > Han
See R FAQ 7.31 Why doesn't R think these numbers are equal? > print(0.9 - 0.8, 20) [1] 0.09999999999999997780 > print(0.8 - 0.7, 20) [1] 0.10000000000000008882 In the first case, the result of the subtraction is slightly less than 0.1, resulting in a negative interval. In the second case, it is slightly greater than 0.1, which is OK. HTH, Marc Schwartz ______________________________________________ [email protected] 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.
