RealQuadEquation Struct Reference

#include <RealQuadEquation.h>

List of all members.

Public Member Functions
	RealQuadEquation (double A, double B, double C)
Public Attributes
double	first
bool	hasSolution
double	second

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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 12 of file RealQuadEquation.h.

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Constructor & Destructor Documentation

RealQuadEquation::RealQuadEquation	(	double	A,
		double	B,
		double	C
	)		[inline]

Definition at line 18 of file RealQuadEquation.h.

References funct::A, funct::C, funct::D, first, lumiQueryAPI::q, edm::second(), and mathSSE::sqrt().

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

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Member Data Documentation

double RealQuadEquation::first

Definition at line 15 of file RealQuadEquation.h.

Referenced by HelixBarrelCylinderCrossing::HelixBarrelCylinderCrossing(), and HelixBarrelPlaneCrossingByCircle::pathLength().

bool RealQuadEquation::hasSolution

Definition at line 14 of file RealQuadEquation.h.

Referenced by HelixBarrelCylinderCrossing::HelixBarrelCylinderCrossing(), and HelixBarrelPlaneCrossingByCircle::pathLength().

double RealQuadEquation::second

Definition at line 16 of file RealQuadEquation.h.

Referenced by HelixBarrelCylinderCrossing::HelixBarrelCylinderCrossing(), and HelixBarrelPlaneCrossingByCircle::pathLength().