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\section{Methods}{
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\section{Methods}{
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  \describe{
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  \describe{
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    \item{coerce}{Methods are defined to coerce arbitrary objects to
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    \item{coerce}{Methods are defined to coerce arbitrary objects to
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      these classes, by calling the corresponding basic function, for
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      these classes, by calling the corresponding basic function, for
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      example, \code{as(x, "matrix")} calls \code{as.matrix(x)}.}
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      example, \code{as(x, "matrix")} calls \code{as.matrix(x)}.}
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    \item{Ops, Math}{Group methods (see, e.g., \code{\link{S4groupGeneric}})
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    \item{Ops}{Group methods (see, e.g., \code{\link{S4groupGeneric}})
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      are defined for combinations of structures and vectors (including
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      are defined for combinations of structures and vectors (including
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      special cases for array and matrix), implementing the concept of
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      special cases for array and matrix), implementing the concept of
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      vector structures as in the reference.
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      vector structures as in the reference.  Essentially, structures
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      combined with vectors retain the structure as long as the
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      resulting object has the same length.  Structures combined with
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      other structures remove the structure, since there is no
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      automatic way to determine what should happen to the slots
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      defining the structure.
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      Note that these methods will be activated when a package is loaded
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      containing a class that inherits from any of the structure
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      classes or class \code{"vector"}.
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    }
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    }
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  }
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  }
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}
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}
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\references{
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\references{
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 Chambers, John M. (2008)
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 Chambers, John M. (2008)