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where \code{Classes} is the character vector that would be the
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where \code{Classes} is the character vector that would be the
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  \code{class} attribute of the S3 object. Calls to
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  \code{class} attribute of the S3 object. Calls to
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  \code{setOldClass()} in the code for a package
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  \code{setOldClass()} in the code for a package
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  allow the class to be used as a slot in formal classes and in
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  allow the class to be used as a slot in formal (S4) classes and in
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  signatures for methods (see \link{Methods_for_S3}).
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  signatures for methods (see \link{Methods_for_S3}).
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  Formal classes can also contain a registered S3 class (see
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  \link{S3Part} for details).
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  If the S3 class has a known set of attributes, an
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  If the S3 class has a known set of attributes, an
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  equivalent S4 class can be specified by \code{S4Class=} in the call to
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  equivalent S4 class can be specified by \code{S4Class=} in the call to
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  \code{setOldClass()}; see the section on \sQuote{Known Attributes}.
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  \code{setOldClass()}; see the section  \dQuote{Known Attributes}.
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}
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}
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\usage{
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\usage{
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setOldClass(Classes, prototype, where, test = FALSE, S4Class)
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setOldClass(Classes, prototype, where, test = FALSE, S4Class)
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}
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}