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}
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}
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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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      If \code{strict = TRUE} in the call to \code{as()}, the method
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      goes on to delete all other slots and attributes other than the
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      \code{dim} and \code{dimnames}.
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    }
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    \item{Ops}{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.  Essentially, structures
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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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      combined with vectors retain the structure as long as the
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      containing a class that inherits from any of the structure
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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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      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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\seealso{Class \linkS4class{nonStructure}, which enforces the
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  alternative model, in which all slots are dropped if any math
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  transformation or operation is applied to an object from a class extending one of
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  the basic classes.
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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)
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 \emph{Software for Data Analysis: Programming with R}
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 \emph{Software for Data Analysis: Programming with R}
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  Springer.  (For the R version.)
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  Springer.  (For the R version.)
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