\section{EXPM Matrix Exponential}

\subsection{Usage}

Calculates \verb|e^A| for a square, full rank matrix \verb|A|.  The
syntax for its use is
\begin{verbatim}
   y = expm(A)
\end{verbatim}
Internally, \verb|expm| is mapped to a simple \verb|e^A| expression (which
in turn uses the eigenvalue expansion of \verb|A| to compute the
exponential).
\subsection{Example}

An example of \verb|expm|
\begin{verbatim}
--> A = [1 1 0; 0 0 2; 0 0 -1]

A = 

  1  1  0 
  0  0  2 
  0  0 -1 

--> expm(A)

ans = 

    2.7183    1.7183    1.0862 
         0    1.0000    1.2642 
         0         0    0.3679 


\end{verbatim}
