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\name{\%s\%}
\alias{\%s\%}
\title{ Direct sum of two arrays }
\description{
This function computes the direct sum of two arrays. The arrays can be
numerical vectors or matrices. The result ia the block diagonal matrix.
}
\usage{
x\%s\%y
}
\arguments{
\item{x}{ a numeric matrix or vector }
\item{y}{ a numeric matrix or vector }
}
\value{
A numeric matrix.
}
\details{
If either \eqn{\bf{x}} or y is a vector, it is converted to a matrix. The result
is a block diagonal matrix \eqn{\left\lbrack {\begin{array}{cc}
{\bf{x}} & {\bf{0}} \\
{\bf{0}} & {\bf{y}} \\
\end{array}} \right\rbrack}.
}
\references{
Magnus, J. R. and H. Neudecker (1999) \emph{Matrix Differential Calculus with Applications in Statistics and Econometrics},
Second Edition, John Wiley.
}
\author{ Frederick Novomestky \email{fnovomes@poly.edu}, Kurt Hornik \email{Kurt.Hornik@wu-wien.ac.at} }
\examples{
x <- matrix( seq( 1, 4 ) )
y <- matrix( seq( 5, 8 ) )
print( x \%s\% y )
}
\keyword{ math }
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