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Rev 88581 Rev 90049
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  like \code{\link{as.vector}} it strips attributes including names.
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  like \code{\link{as.vector}} it strips attributes including names.
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  (To ensure that an object is of double type without stripping
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  (To ensure that an object is of double type without stripping
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  attributes, use \code{\link{storage.mode}}.)  Character strings
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  attributes, use \code{\link{storage.mode}}.)  Character strings
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  containing optional whitespace followed by either a decimal
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  containing optional whitespace followed by either a decimal
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  representation or a hexadecimal representation (starting with
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  representation or a hexadecimal representation (starting with
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  \code{0x} or \code{0X}) can be converted, as can special values such
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  \samp{0x} or \samp{0X}) can be converted, as can special values such
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  as \code{"NA"}, \code{"NaN"}, \code{"Inf"} and \code{"infinity"},
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  as \code{"NA"}, \code{"NaN"}, \code{"Inf"} and \code{"infinity"},
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  irrespective of case.
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  irrespective of case.
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  \code{as.double} for factors yields the codes underlying the factor
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  \code{as.double} for factors yields the codes underlying the factor
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  levels, not the numeric representation of the labels, see also
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  levels, not the numeric representation of the labels, see also