Inline Below. Bert Gunter Nonclinical Biostatistics 467-7374
http://devo.gene.com/groups/devo/depts/ncb/home.shtml -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Michael Knudsen Sent: Wednesday, September 30, 2009 11:50 AM To: Duncan Murdoch Cc: r help Subject: Re: [R] Rounding error in seq(...) On Wed, Sep 30, 2009 at 8:44 PM, Duncan Murdoch <murd...@stats.uwo.ca> wrote: > Why? You asked for an increment of 1 in the second case (which is exactly > represented in R), then divided by 10, so you'll get the same as 0.3 gives > you. In the seq() case you asked for an increment of a number close to but > not equal to 1/10 (because 1/10 is not exactly representable in R), so you > got something different. Well, the problem is that I don't know how seq is implemented. I just assumed that it wouldn't behave like this. -- This represents common misconceptions about the nature of floating point computations/finite precision arithmetic. See 7.31 in the R FAQ. You may wish to Google/Wikipedia on "floating point computation" or something similar for more info. -- Bert ______________________________________________ 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.