#include <RealQuadEquation.h>

Public Member Functions
	RealQuadEquation (double A, double B, double C)

Public Attributes
double	first

bool	hasSolution

double	second

Detailed Description

A numericaly stable and as fast as can be quadratic equation solver. The equation has the form A*x^2 + B*x + C = 0

Definition at line 11 of file RealQuadEquation.h.

Constructor & Destructor Documentation

◆ RealQuadEquation()

RealQuadEquation::RealQuadEquation	(	double	A,
		double	B,
		double	C
	)

inline

Definition at line 16 of file RealQuadEquation.h.

References A, B, correctionTermsCaloMet_cff::C, dqmdumpme::first, submitPVResolutionJobs::q, edm::second(), and mathSSE::sqrt().

                                                  {
     double D = B * B - 4 * A * C;
     if (D < 0)
       hasSolution = false;
     else {
       hasSolution = true;
       auto q = -0.5 * (B + std::copysign(std::sqrt(D), B));
       first = q / A;
       second = C / q;
     }
   }