docs: public static double normF( DMatrixD1 a ) {
          double total = 0;
  
          double scale = CommonOps_DDRM.elementMaxAbs(a);
  
          if( scale == 0.0 )
              return 0.0;
  
          final int size = a.getNumElements();
  
          for( int i = 0; i < size; i++ ) {
              double val = a.get(i)/scale;
              total += val*val;
          }
  
          return scale * Math.sqrt(total);
      }