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  as necessary (with a \code{\link{warning}} when they are recycled only
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  as necessary (with a \code{\link{warning}} when they are recycled only
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  \emph{fractionally}).  The operators are \code{+} for addition,
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  \emph{fractionally}).  The operators are \code{+} for addition,
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  \code{-} for subtraction, \code{*} for multiplication, \code{/} for
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  \code{-} for subtraction, \code{*} for multiplication, \code{/} for
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  division and \code{^} for exponentiation.
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  division and \code{^} for exponentiation.
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  \code{\%\%} indicates \code{x mod y} (\dQuote{x modulo y}), i.e.,
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  \code{\%\%} indicates \code{x} mod \code{y} (\dQuote{x modulo y}), i.e.,
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  computes the \sQuote{remainder} \code{r <- x \%\% y}, and
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  computes the \sQuote{remainder} \code{r <- x \%\% y}, and
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  \code{\%/\%} indicates integer division, where \R uses \dQuote{floored}
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  \code{\%/\%} indicates integer division, where \R uses \dQuote{floored}
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  integer division, i.e., \code{q <- x \%/\% y := floor(x/y)}, as promoted
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  integer division, i.e., \code{q <- x \%/\% y := floor(x/y)}, as promoted
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  by Donald Knuth, see the Wikipedia page on \sQuote{Modulo operation},
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  by Donald Knuth, see the Wikipedia page on \sQuote{Modulo operation},
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  and hence \code{sign(r) == sign(y)}.  It is guaranteed that
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  and hence \code{sign(r) == sign(y)}.  It is guaranteed that