docs: public static double normF( ZMatrixRMaj a ) {
          double total = 0;
  
          double scale = CommonOps_ZDRM.elementMaxAbs(a);
  
          if( scale == 0.0 )
              return 0.0;
  
          final int size = a.getDataLength();
  
          for( int i = 0; i < size; i += 2 ) {
              double real = a.data[i]/scale;
              double imag = a.data[i+1]/scale;
  
              total += real*real + imag*imag;
          }
  
          return scale* Math.sqrt(total);
      }