var()

ring_elem PolyRing::var ( int v ) const

virtual

Implements PolynomialRing.

Definition at line 299 of file poly.cpp.

{
  exponents_t EXP1 = ALLOCATE_EXPONENTS(exp_size);
  for (int i = 0; i < nvars_; i++) EXP1[i] = 0;
  if (v >= 0 && v < nvars_)
    EXP1[v] = 1;
  else
    {
      std::cerr << "internal error: PolyRing::var(int v) with v = " << v
                << "  nvars = " << nvars_ << std::endl;
      std::cerr << "aborting" << std::endl;
      abort();
      return ZERO_RINGELEM;
    }
  Nterm *result = new_term();
  result->coeff = K_->from_long(1);
  M_->from_expvector(EXP1, result->monom);
  return result;
}

References ALLOCATE_EXPONENTS, PolynomialRing::exp_size, PolynomialRing::K_, PolynomialRing::M_, new_term(), PolynomialRing::nvars_, result(), and ZERO_RINGELEM.

Referenced by fromSmallIntegerCoefficients(), and lead_term().