\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 = 
  <int32>  - size: [2 4]
 
Columns 1 to 4
 1  0  0  5  
 0  3  2  0  
--> issparse(a)
ans = 
  <logical>  - size: [1 1]
 0  
--> A = sparse(a)
A = 
  <int32>  - size: [2 4]
	Matrix is sparse with 4 nonzeros
--> issparse(A)
ans = 
  <logical>  - size: [1 1]
 1  

\end{verbatim}
