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}
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}
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\details{
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\details{
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  \code{X} and \code{Y} must be suitable arguments for \code{FUN}.  Each
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  \code{X} and \code{Y} must be suitable arguments for \code{FUN}.  Each
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  will be extended by \code{\link{rep}} to length the products of the
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  will be extended by \code{\link{rep}} to length the products of the
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  lengths of \code{X} and \code{Y} before \code{FUN} is called.
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  lengths of \code{X} and \code{Y} before \code{FUN} is called.
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  \code{FUN} is called with these two extended vectors as
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  \code{FUN} is called with these two extended vectors as
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  arguments. Therefore, it must be a vectorized function (or the
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  arguments. Therefore, it must be a vectorized function (or the
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  name of one), expecting at
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  name of one), expecting at
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  least two arguments.
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  least two arguments.
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  if dimensions do not exist).
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  if dimensions do not exist).
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  \code{FUN = "*"} is handled internally as a special case, \emph{via}
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  \code{FUN = "*"} is handled internally as a special case, \emph{via}
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  \code{as.vector(X) \%*\% t(as.vector(Y))}, and is intended only for
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  \code{as.vector(X) \%*\% t(as.vector(Y))}, and is intended only for
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  numeric vectors and arrays.
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  numeric vectors and arrays.
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  \code{\%o\%} is binary operator providing a wrapper for
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  \code{\%o\%} is binary operator providing a wrapper for
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  \code{outer(x, y, "*")}.
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  \code{outer(x, y, "*")}.
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}
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}
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\author{Jonathan Rougier}
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\author{Jonathan Rougier}
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\references{
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\references{