int Sign_Polynomial_Interval(int Degree,VECTOR &Coeff,REAL P) int Sign_Polynomial_Interval(int Degree,INTERVAL_VECTOR &Coeff,REAL P) int Sign_Polynomial_Interval(int Degree,INTERVAL_VECTOR &Coeff,REAL P) int Sign_Polynomial_Interval(int Degree,INTERVAL_VECTOR &Coeff,INTERVAL P)with:
This procedure returns 1 if the polynomial is positive, -1 if it is negative, 0 if it is 0 and 2 if the sign is either affected by numerical errors (if Coeff and P are REAL) or is not constant (if Coeff or P are INTERVAL_VECTOR).