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\par
\section{Data Structure}
\label{section:Pencil:dataStructure}
\par
\par
The {\tt Pencil} structure has the following fields.
\begin{itemize}
\item
{\tt int type} : type of matrix entries,
\begin{itemize}
\item {\tt SPOOLES\_REAL} for real entries
\item {\tt SPOOLES\_COMPLEX} for complex entries
\end{itemize}
\item
{\tt int symflag} : type of symmetry present in the matrices
\begin{itemize}
\item {\tt SPOOLES\_SYMMETRIC} for real or complex symmetric matrices
\item {\tt SPOOLES\_HERMITIAN} for complex Hermitian matrices
\item {\tt SPOOLES\_NONSYMMETRIC}
for real or complex nonsymmetric matrices
\end{itemize}
\item
{\tt InpMtx *inpmtxA} : pointer to the matrix object for $A$.
If {\tt inpmtxA} is {\tt NULL}, then $A$ is the identity matrix.
\item
{\tt InpMtx *inpmtxB} : pointer to the matrix object for $B$.
If {\tt inpmtxB} is {\tt NULL}, then $B$ is the identity matrix.
\item
{\tt double sigma[2]} : real or complex scalar shift value.
\end{itemize}
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