var()

TowerPolynomial DPoly::var	(	int	level,
		int	v )

Definition at line 515 of file dpoly.cpp.

{
  if (v > level) return nullptr;
  int which = (v == 0 ? 1 : 0);
  TowerPolynomial result =
      alloc_poly_0(which);  // TODO: check that this initializes elements to 0
  result->arr.ints[which] = 1;
  for (int i = 1; i <= level; i++)
    {
      which = (i == v ? 1 : 0);
      TowerPolynomial a = result;
      result = alloc_poly_n(which);
      result->arr.polys[which] = a;
    }
  return result;
}

References alloc_poly_0(), alloc_poly_n(), and result().

Referenced by subtract_multiple_to().