reduce_lead_term_QQ()

void QRingInfo_field_QQ::reduce_lead_term_QQ ( Nterm *& f, const Nterm * g ) const

private

Definition at line 188 of file qring.cpp.

{
  monomial MONOM1 = ALLOCATE_MONOMIAL(monom_size);
  const Monoid *M = R->getMonoid();
  M->divide(f->monom, g->monom, MONOM1);
  ring_elem c = globalQQ->RingQQ::negate(f->coeff);
  c = globalQQ->RingQQ::divide(c, g->coeff);
  if (R->is_skew_commutative())
    {
      exponents_t EXP1 = ALLOCATE_EXPONENTS(exp_size);
      exponents_t EXP2 = ALLOCATE_EXPONENTS(exp_size);
      // We need to determine the sign
      M->to_expvector(g->monom, EXP2);
      M->to_expvector(MONOM1, EXP1);
      if (R->getSkewInfo().mult_sign(EXP1, EXP2) < 0)
        globalQQ->RingQQ::negate_to(c);
    }
  ring_elem g1 = const_cast<Nterm *>(g);
  g1 = R->mult_by_term(g1, c, MONOM1);
  ring_elem f1 = f;
  R->internal_add_to(f1, g1);
  f = f1;
}

References ALLOCATE_EXPONENTS, ALLOCATE_MONOMIAL, Nterm::coeff, Monoid::divide(), QRingInfo::exp_size, globalQQ, Nterm::monom, QRingInfo::monom_size, monomial, QRingInfo::R, and Monoid::to_expvector().

Referenced by normal_form().