set_entry()

void Ring::set_entry	(	vec &	v,
		int	i,
		ring_elem	r ) const

Definition at line 641 of file ring-vecs.cpp.

{
  vec p;
  bool iszero = this->is_zero(a);
  vecterm head;
  head.next = v;
  for (p = &head; p->next != nullptr; p = p->next)
    if (p->next->comp <= r) break;
 
  if (p->next == nullptr || p->next->comp < r)
    {
      if (iszero) return;
      vec w = new_vec();
      w->next = p->next;
      w->comp = r;
      w->coeff = a;
      p->next = w;
    }
  else if (p->next->comp == r)
    {
      if (iszero)
        {
          // delete node
          vec tmp = p->next;
          p->next = tmp->next;
          remove_vec_node(tmp);
        }
      else
        p->next->coeff = a;
    }
  v = head.next;
}

References is_zero(), new_vec(), vec::next, p, and remove_vec_node().