degree_of_var()

void PolyRing::degree_of_var ( int n, const ring_elem a, int & lo, int & hi ) const

virtual

Implements PolynomialRing.

Definition at line 2115 of file poly.cpp.

{
  Nterm *t = a;
  if (t == nullptr)
    {
      ERROR("attempting to find degree of a zero element");
      return;
    }
  exponents_t exp = newarray_atomic(int, n_vars());
  M_->to_expvector(t->monom, exp);
  lo = hi = exp[n];
  for (t = t->next; t != nullptr; t = t->next)
    {
      M_->to_expvector(t->monom, exp);
      if (exp[n] < lo)
        lo = exp[n];
      else if (exp[n] > hi)
        hi = exp[n];
    }
  freemem(exp);
}

References ERROR, freemem(), PolynomialRing::M_, Nterm::monom, PolynomialRing::n_vars(), newarray_atomic, and Nterm::next.