thank you to all who answered.
> 0+0.05+ + 0.05+0.05+0.05+0.05+0.05+0.05+ + 0.05+0.05+0.05+0.05+0.05+0.05+ + 0.05+0.05+0.05+0.05+0.05+0.05 - 0.95 [1] 3.330669e-16 > seq(0,1,0.05)[20] - 0.95 [1] 1.110223e-16 > 0+19*0.05 - 0.95 [1] 1.110223e-16 so this is the way seq calculates. I would have guessed that addition was more accurate than multiplication, but that is not the case. this one however bothers me: > 19/20-0.95 [1] 0 I noticed this problem when I tried to extract rows of a matrix according to whether values of some vector where in the set (0,0.05,...,0.95,1), with something like x%in%seq(0,1,0.05) Now I understand that I should not use this construction unless x is of type integer. Would you agree? Eric Elguero ______________________________________________ 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.
