[R] seq unexpected behavior
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
sessionInfo()
R version 2.2.1, 2005-12-20, i386-pc-mingw32
attached base packages:
[1] methods stats graphics grDevices utils
datasets
[7] base
(NB I also tried version 2.3.1 and got the same result - both versions
are precompiled)
Sys.getlocale()
[1] LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252
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Re: [R] seq unexpected behavior
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] 0.09997780 print(0.8 - 0.7, 20) [1] 0.10008882 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 __ R-help@stat.math.ethz.ch 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.
