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  \code{numeric} is identical to \code{\link{double}} (and \code{real}).
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  \code{numeric} is identical to \code{\link{double}} (and \code{real}).
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  It creates a double-precision vector of the specified length with each
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  It creates a double-precision vector of the specified length with each
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  element equal to \code{0}.
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  element equal to \code{0}.
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  \code{as.numeric} is a generic function, but S3 methods must be
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  \code{as.numeric} is a generic function, but S3 methods must be
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  written for \code{\link{as.double}}.  It is identical to
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  written for \code{\link{as.double}}.  It is identical to \code{as.double}.
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  \code{as.double} (and \code{as.real}).
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  \code{is.numeric} is an \link{internal generic} \code{primitive}
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  \code{is.numeric} is an \link{internal generic} \code{primitive}
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  function: you can write methods to handle specific classes of objects,
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  function: you can write methods to handle specific classes of objects,
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  see \link{InternalMethods}.  It is \strong{not} the same as
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  see \link{InternalMethods}.  It is \strong{not} the same as
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  \code{\link{is.double}}.  Factors are handled by the default method,
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  \code{\link{is.double}}.  Factors are handled by the default method,
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}
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}
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\section{S4 methods}{
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\section{S4 methods}{
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  \code{as.numeric} and \code{is.numeric} are internally S4 generic and
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  \code{as.numeric} and \code{is.numeric} are internally S4 generic and
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  so methods can be set for them \emph{via} \code{setMethod}.
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  so methods can be set for them \emph{via} \code{setMethod}.
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  To ensure that \code{as.numeric}, \code{as.double} and \code{as.real}
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  To ensure that \code{as.numeric} and \code{as.double}
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  remain identical, S4 methods can only be set for \code{as.numeric}.
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  remain identical, S4 methods can only be set for \code{as.numeric}.
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}
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}
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%% keep next the same in double.Rd & numeric.Rd
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%% keep next the same in double.Rd & numeric.Rd
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\section{Note on names}{
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\section{Note on names}{
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  It is a historical anomaly that \R has two names for its
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  It is a historical anomaly that \R has two names for its