text: // ======================================================================
  //  Copyright (c) 2004-2010, G. Fiori, G. Iannaccone  University of Pisa
  //  
  //  This file is released under the BSD license.
  //  See the file "license.txt" for information on usage and
  //  redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
  // ====================================================================== 
  #include <math.h>
  #ifndef NORMA2_H
  #define NORMA2_H
  double norma2(double *vett,int nnn);
  #endif
  