3 messages · samaya6501 at yahoo.com.tw, Christian Brechbühler, Thomas Lumley
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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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
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 tlumley at u.washington.edu University of Washington, Seattle