Not a bug. None of these numbers are exactly representable in binary, so
you can't expect accuracy of better than machine epsilon.
Please don't report things that aren't bugs to r-bugs.
-thomas
On Fri, 8 Aug 2008, [EMAIL PROTECTED] wrote:
Full_Name: Tom Wang
Version: 2.6.2
OS: Linux, Windows
Submission from: (NULL) (61.230.6.228)
I've found an instance:
a <- c(0.187,-0.019,0.074,-0.06,0.221,-0.079,0.12,0.079,-0.281,-0.242)
sum(a)
[1] -2.428613e-17
The actual sum is 0 but it reports the wrong answer.
Maybe it is due to the computer truncation error.
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Thomas Lumley Assoc. Professor, Biostatistics
[EMAIL PROTECTED] University of Washington, Seattle
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