join()

MonomialOrdering * MonomialOrderings::join ( const std::vector< MonomialOrdering * > & M )

static

Definition at line 206 of file monomial-ordering.cpp.

{
  MonomialOrdering *result;
  const MonomialOrdering *mo;
  int i, j, sum, next;
  int nvars_so_far = 0;
 
  sum = 0;
  for (i = 0; i < M.size(); i++)
    {
      mo = M[i];
      for (j = 0; j < mo->len; j++)
        if (is_good(mo->array[j])) sum++;
    }
 
  result = make_mon_order(sum);
  next = 0;
  for (i = 0; i < M.size(); i++)
    {
      mo = M[i];
      for (j = 0; j < mo->len; j++)
        {
          mon_part p = mo->array[j];
          if (!is_good(p)) continue;
          if (p->type != MO_WEIGHTS)
            nvars_so_far += p->nvars;
          else
            {
              /* Shift the weights over by nvars_so_far */
              mon_part q = mo_make(MO_WEIGHTS, nvars_so_far + p->nvars, nullptr);
              q->wts = getmemvectortype(int, q->nvars);
              for (j = 0; j < nvars_so_far; j++) q->wts[j] = 0;
              for (; j < q->nvars; j++) q->wts[j] = p->wts[j - nvars_so_far];
              p = q;
            }
          result->array[next++] = p;
        }
    }
  return result;
}

References MonomialOrdering::array, getmemvectortype, is_good(), MonomialOrdering::len, make_mon_order(), mo_make(), MO_WEIGHTS, p, and result().

Referenced by degreeMonoid(), simplePolynomialRing(), and TEST().