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  Simple manipulation of (a small set of) integer numbers as roman numerals.
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  Simple manipulation of (a small set of) integer numbers as roman numerals.
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}
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}
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\usage{
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\usage{
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as.roman(x)
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as.roman(x)
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.romans
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.romans
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\special{% no \alias
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r1 + r2
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r1 + r2
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r1 <= r2
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r1 <= r2
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max(r1)
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max(r1)
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sum(r2)
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sum(r2)
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}
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}
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}
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\arguments{
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\arguments{
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  \item{x}{a numeric or character vector of arabic or roman numerals.}
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  \item{x}{a numeric or character vector of arabic or roman numerals.}
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  \item{r1, r2}{a roman number vector, i.e., of \code{\link{class}} \code{"roman"}.}
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  \item{r1, r2}{a roman number vector, i.e., of \code{\link{class}}
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    \code{"roman"}.}
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}
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}
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\details{
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\details{
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  \code{as.roman} creates objects of class \code{"roman"} which are
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  \code{as.roman} creates objects of class \code{"roman"} which are
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  internally represented as integers, and have suitable methods for
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  internally represented as integers, and have suitable methods for
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  printing, formatting, subsetting, coercion, etc, see
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  printing, formatting, subsetting, coercion, etc, see