fp t9,
   t8;
      t9 = RATIONAL(-1.0,2.0);
      t8 = RATIONAL(1.0,2.0);
      coeff_dx_0_0 = t9;
      coeff_dx_p1_0 = t8;
      coeff_dx_0_p1 = t9;
      coeff_dx_p1_p1 = t8;