\section{ISSPARSE Test for Sparse Matrix}

\subsection{Usage}

Test a matrix to see if it is sparse or not.  The general
format for its use is 
\begin{verbatim}
   y = issparse(x)
\end{verbatim}
This function returns true if \verb|x| is encoded as a sparse
matrix, and false otherwise.
\subsection{Example}

Here is an example of using \verb|issparse|:
\begin{verbatim}
--> a = [1,0,0,5;0,3,2,0]

a = 

 1 0 0 5 
 0 3 2 0 

--> issparse(a)

ans = 

 0 

--> A = sparse(a)

A = 
	Matrix is sparse with 4 nonzeros
--> issparse(A)

ans = 

 1 


\end{verbatim}
