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\par
\section{Data Structure}
\label{section:SemiImplMtx:dataStructure}
\par
\par
The {\tt SemiImplMtx} structure has the following fields.
\begin{itemize}
\item
{\tt int neqns} : number of equations.
\item
{\tt int type} : type of entries, {\tt SPOOLES\_REAL} or
{\tt SPOOLES\_COMPLEX}.
\item
{\tt int symmetryflag} : type of matrix symmetry,
{\tt SPOOLES\_SYMMETRIC}, {\tt SPOOLES\_HERMITIAN} or
{\tt SPOOLES\_NONSYMMETRIC}.
\item
{\tt int ndomeqns} : number of equations in the domains,
or (1,1) block.
\item
{\tt int nschureqns} : number of equations in the Schur complement,
or (2,2) block.
\item
{\tt FrontMtx *domainMtx} : matrix object for
$L_{1,1}$, $D_{1,1}$ and $U_{1,1}$.
\item
{\tt FrontMtx *schurMtx} : matrix object for
$L_{2,2}$, $D_{2,2}$ and $U_{2,2}$.
\item
{\tt InpMtx *A21} : matrix object for ${\widehat A}_{2,1}$.
\item
{\tt InpMtx *A12} : matrix object for ${\widehat A}_{1,2}$.
\item
{\tt IV *domRowsIV} : object that holds the global ids of the rows
in ${\widehat A}_{1,1}$.
\item
{\tt IV *schurRowsIV} : object that holds the global ids of the rows
in ${\widehat A}_{2,2}$.
\item
{\tt IV *domColumnsIV} : object that holds the global ids of the
columns in ${\widehat A}_{1,1}$.
\item
{\tt IV *schurColumnsIV} : object that holds the global ids of the
columns in ${\widehat A}_{2,2}$.
\end{itemize}
\par
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