This is also mentioned in FAQ 7.31
http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-doesn_0027t-R-think-these-numbers-are-equal_003f
Also if you search the R-help archives for 'precision' you can find a
lot of threads discussing the issue in further depth.
On Sun, Jul 11, 2010 at 9:02 PM, Wu Gon
I don't know the real reason, but help("==") gives some clues.
For numerical and complex values, remember == and != do not allow for the
finite representation of fractions, nor for rounding error. Using all.equal
with identical is almost always preferable. See the examples.
x1 <- 0.5 - 0.3
x2
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