\section{XNRM2 BLAS Norm Calculation}

\subsection{Usage}

Calculates the 2-norm of a vector.  The syntax for its use
is
\begin{verbatim}
   y = xnrm2(A)
\end{verbatim}
where \verb|A| is the n-dimensional array to analyze.  This form
uses the underlying BLAS implementation to compute the 2-norm.
