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 <- 0.3 - 0.1
x1 == x2 # FALSE on most machines
identical(all.equal(x1, x2), TRUE) # TRUE everywhere
-----
A R learner.
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