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  latter, see \code{\link{rle}}).
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  latter, see \code{\link{rle}}).
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  Missing values are regarded as equal, but \code{NaN} is not equal to
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  Missing values are regarded as equal, but \code{NaN} is not equal to
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  \code{NA_real_}.  Character strings are regarded as equal if they are
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  \code{NA_real_}.  Character strings are regarded as equal if they are
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  in different encodings but would agree when translated to UTF-8.
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  in different encodings but would agree when translated to UTF-8.
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  Values in \code{incomparables} will never be marked as duplicated.
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  Values in \code{incomparables} will never be marked as duplicated.
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  This is intended to be used for a fairly small set of values and will
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  This is intended to be used for a fairly small set of values and will
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  not be efficient for a very large set.
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  not be efficient for a very large set.
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  When used on a data frame with more than one column, or an array or
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  When used on a data frame with more than one column, or an array or
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  matrix when comparing dimensions of length greater than one, this
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  matrix when comparing dimensions of length greater than one, this
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  tests for identity of character representations.  This will
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  tests for identity of character representations.  This will
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  catch people who unwisely rely on exact equality of floating-point
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  catch people who unwisely rely on exact equality of floating-point
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  numbers!
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  numbers!