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% File src/library/methods/man/setOldClass.Rd
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% File src/library/methods/man/setOldClass.Rd
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% Part of the R package, https://www.R-project.org
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% Part of the R package, https://www.R-project.org
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% Copyright 1995-2025, 2016 R Core Team
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% Copyright 1995-2026 R Core Team
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% Distributed under GPL 2 or later
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% Distributed under GPL 2 or later
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\name{setOldClass}
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\name{setOldClass}
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\alias{setOldClass}
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\alias{setOldClass}
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\alias{.setOldIs}
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\alias{.setOldIs}
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\alias{anova.glm.null-class}
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\alias{anova.glm.null-class}
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\alias{Date-class}
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\alias{Date-class}
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\alias{data.frame-class}
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\alias{data.frame-class}
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\alias{data.frameRowLabels-class}
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\alias{data.frameRowLabels-class}
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\alias{density-class}
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\alias{density-class}
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\alias{difftime-class}
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\alias{dump.frames-class}
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\alias{dump.frames-class}
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\alias{factor-class}
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\alias{factor-class}
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\alias{formula-class}
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\alias{formula-class}
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\alias{glm-class}
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\alias{glm-class}
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\alias{glm.null-class}
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\alias{glm.null-class}
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allowed, but not recommended in typical applications.}
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allowed, but not recommended in typical applications.}
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\code{prototype}:
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\code{prototype}:
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An optional object to use as the prototype. If the S3 class is
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An optional object to use as the prototype. If the S3 class is
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not to be \code{VIRTUAL} (the default), the use of \code{S4Class=} is
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not to be \code{VIRTUAL} (the default), the use of \code{S4Class=} is
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preferred.
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preferred.
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\code{where}:
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\code{where}:
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Where to store the class definitions. Should be the default (the
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Where to store the class definitions. Should be the default (the
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package namespace) for normal use in an application package.
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package namespace) for normal use in an application package.
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\code{test}: flag, if \code{TRUE}, arrange to test inheritance
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\code{test}: flag, if \code{TRUE}, arrange to test inheritance
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explicitly for each object, needed if the S3 class can have a
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explicitly for each object, needed if the S3 class can have a
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different set of class strings, with the same first string.
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different set of class strings, with the same first string.
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Such classes are inherently malformed, are rare, and should be avoided.
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Such classes are inherently malformed, are rare, and should be avoided.
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}
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}
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\section{Pre-Defined Old Classes}{
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\section{Pre-Defined Old Classes}{
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Many of the widely used S3 classes in the standard R distribution
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Many of the widely used S3 classes in the standard R distribution
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come pre-defined for use with S4. These don't need to be explicitly
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come pre-defined for use with S4. These don't need to be explicitly
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declared in your package (although it does no harm to do so).
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declared in your package (although it does no harm to do so).
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The list \code{.OldClassesList} contains the old-style classes that
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The list \code{.OldClassesList} contains the old-style classes that
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are defined by the methods package. Each element of the list is a
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are defined by the methods package. Each element of the list is a
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character vector, with multiple strings if inheritance is included.
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character vector, with multiple strings if inheritance is included.
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Each element of the list was passed to \code{setOldClass} when
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Each element of the list was passed to \code{setOldClass} when
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creating the \pkg{methods} package; therefore, these classes can be used
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creating the \pkg{methods} package; therefore, these classes can be used
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