[R] problem with comparisons for vectors

[Wu Gong]

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


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A R learner.
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