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\usage{
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\usage{
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isS3method(method, f, class, envir = parent.frame())
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isS3method(method, f, class, envir = parent.frame())
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}
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}
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\arguments{
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\arguments{
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  \item{method}{a character string, typically of the form
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  \item{method}{a character string, typically of the form
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    \code{"<fn>.<class>"}.  If omitted, \code{f} and \code{class} have
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    \code{"\var{fn}.\var{class}"}.  If omitted, \code{f} and \code{class} have
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    to be specified instead.}
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    to be specified instead.}
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  \item{f}{optional character string, typically specifying an S3 generic
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  \item{f}{optional character string, typically specifying an S3 generic
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    function.  Used, when \code{method} is not specified.}
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    function.  Used, when \code{method} is not specified.}
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  \item{class}{optional character string, typically specifying an S3
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  \item{class}{optional character string, typically specifying an S3
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    class name.  Used, when \code{method} is not specified.}
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    class name.  Used, when \code{method} is not specified.}
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  \item{envir}{the \code{\link{environment}} in which the method and its
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  \item{envir}{the \code{\link{environment}} in which the method and its
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    generic are searched first, as in \code{\link{getS3method}()}.}
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    generic are searched first, as in \code{\link{getS3method}()}.}
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}
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}
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%% \details{
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%% }
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\value{
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\value{
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  \code{\link{logical}} \code{TRUE} or \code{FALSE}
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  \code{\link{logical}} \code{TRUE} or \code{FALSE}
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}
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}
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\seealso{
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\seealso{
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  \code{\link{methods}}, \code{\link{getS3method}}.
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  \code{\link{methods}}, \code{\link{getS3method}}.