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class \code{from} to class \code{to}. The methods will then be used
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class \code{from} to class \code{to}. The methods will then be used
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by calls to \code{\link{as}} for objects with class \code{from},
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by calls to \code{\link{as}} for objects with class \code{from},
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including calls that replace part of the object.
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including calls that replace part of the object.
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Methods for this purpose work indirectly, by defining methods for
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Methods for this purpose work indirectly, by defining methods for
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function \code{coerce}. This function is \emph{not} to be called
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function \code{coerce}. The \code{coerce} function is \emph{not} to
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directly, and method selection uses class inheritance only on the
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be called directly, and method selection uses class inheritance only
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first argument.
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on the first argument.
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}
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}
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\usage{
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\usage{
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- |
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setAs(from, to, def, replace, where = topenv(parent.frame()))
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setAs(from, to, def, replace, where = topenv(parent.frame()))
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- |
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}
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}
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- |
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\arguments{
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\arguments{
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\item{from, to}{The classes between which the coerce methods
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\item{from, to}{The classes between which the coerce methods
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\code{def} and \code{replace} perform coercion.
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\code{def} and \code{replace} perform coercion.
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}
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}
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\item{def}{function of one argument. It will get an object from
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\item{def}{function of one argument. It will get an object from
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class \code{from} and had better return an object of class
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class \code{from} and had better return an object of class
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\code{to}. The convention is that
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\code{to}. The convention is that
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the name of the argument is \code{from}; if another argument name
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the name of the argument is \code{from}; if another argument name
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is used, \code{setAs} will attempt to substitute \code{from}. }
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is used, \code{setAs} will attempt to substitute \code{from}. }
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\item{replace}{if supplied, the function to use as a replacement
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\item{replace}{if supplied, the function to use as a replacement
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method, when \code{as} is used on the left of an assignment.
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method, when \code{as} is used on the left of an assignment.
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Should be a function of two arguments, \code{from, value},
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Should be a function of two arguments, \code{from, value},
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although \code{setAs} will attempt to substitute if the arguments
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although \code{setAs} will attempt to substitute if the arguments
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differ.
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differ.
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\emph{The remaining argument will not be used in standard applications.}
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\emph{The remaining argument will not be used in standard applications.}
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}
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}
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60 |
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\item{where}{the position or environment in which to store the
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\item{where}{the position or environment in which to store the
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resulting methods. Do not use this argument when defining a method
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resulting methods. Do not use this argument when defining a method
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in a package. Only the default, the namespace of the package,
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in a package. Only the default, the namespace of the package,
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The R Project SVN
R