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}
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}
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\details{
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\details{
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  \code{\link{xy.coords}} is used to interpret the specification of the
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  \code{\link{xy.coords}} is used to interpret the specification of the
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  points. Infinite, missing and \code{NaN} values are not allowed.
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  points. Infinite, missing and \code{NaN} values are not allowed.
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  \bibinfo{R:Eddy:1977a}{year}{1977a}
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  \bibinfo{R:Eddy:1977b}{year}{1977b}
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  The algorithm is that given by \bibcitet{R:Eddy:1977a, R:Eddy:1977b}.
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  The algorithm is that given by \bibcitet{R:Eddy:1977a, R:Eddy:1977b}.
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}
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}
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\value{
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\value{
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  An integer vector giving the indices of the unique points lying on the
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  An integer vector giving the indices of the unique points lying on the
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  convex hull, in clockwise order.  (The first will be returned for
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  convex hull, in clockwise order.  (The first will be returned for