XNRM2  XNRM2 BLAS Norm Calculation


Usage
 
 Calculates the 2-norm of a vector.  The syntax for its use
 is
 
    y = xnrm2(A)
 
 where A is the n-dimensional array to analyze.  This form
 uses the underlying BLAS implementation to compute the 2-norm.
 