\Header{crossprod}{Matrix Crossproduct}
\keyword{algebra}{crossprod}
\keyword{array}{crossprod}
\begin{Usage}
\begin{verbatim}
crossprod(x, y=x)
\end{verbatim}
\end{Usage}
\begin{Description}
Given matrices \texttt{x} and \texttt{y} as arguments,
\texttt{t} returns their matrix cross-product.
This is formally equivalent to, but faster than, the
call \texttt{t(x) \%*\% y}.\end{Description}
\begin{SeeAlso}
\texttt{\Link{outer}}\end{SeeAlso}
\begin{Examples}
\begin{ExampleCode}
crossprod(1:4)# = sum(1 + 2^2 + 3^2 + 4^2)
\end{ExampleCode}
\end{Examples}

