\section{ETIME Elapsed Time Function}

\subsection{Usage}

The \verb|etime| calculates the elapsed time between two \verb|clock| vectors
\verb|x1| and \verb|x2|.  The syntax for its use is
\begin{verbatim}
   y = etime(x1,x2)
\end{verbatim}
where \verb|x1| and \verb|x2| are in the \verb|clock| output format
\begin{verbatim}
   x = [year month day hour minute seconds]
\end{verbatim}
\subsection{Example}

Here we use \verb|etime| as a substitute for \verb|tic| and \verb|toc|
\begin{verbatim}
--> x1 = clock;
--> sleep(1);
--> x2 = clock;
--> etime(x2,x1);

\end{verbatim}
