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\details{
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\details{
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  \code{is.function} is generic: you can write methods to handle
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  \code{is.function} is generic: you can write methods to handle
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  specific classes of objects, see \link{InternalMethods}.
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  specific classes of objects, see \link{InternalMethods}.
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  \code{is.primitive(x)} tests if \code{x} is a primitive function
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  \code{is.primitive(x)} tests if \code{x} is a primitive function
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  (either a \code{"builtin"} or \code{"special"}, see \code{\link{typeof}})?
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  (either a \code{"builtin"} or \code{"special"} as from \code{\link{typeof}})?
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}
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}
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\value{
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\value{
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  \code{TRUE} if \code{x} is a (primitive) function, and \code{FALSE}
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  \code{TRUE} if \code{x} is a (primitive) function, and \code{FALSE}
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  otherwise.
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  otherwise.
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}
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}