RZLine Class Reference

#include <RZLine.h>

Public Member Functions
float	chi2 (float cotTheta, float intercept) const
void	fit (float &cotTheta, float &intercept, float &covss, float &covii, float &covsi) const
	RZLine (const std::vector< GlobalPoint > &points, const std::vector< GlobalError > &errors, const std::vector< bool > &isBarrel)
	RZLine (const std::vector< float > &aR, const std::vector< float > &aZ, const std::vector< float > &aErrZ)

Private Attributes
float *	errZ2
int	nPoints
float *	r
std::vector< float >	storage
float *	z

Detailed Description

Definition at line 8 of file RZLine.h.

Constructor & Destructor Documentation

RZLine::RZLine	(	const std::vector< GlobalPoint > &	points,
		const std::vector< GlobalError > &	errors,
		const std::vector< bool > &	isBarrel
	)

Definition at line 22 of file RZLine.cc.

References errZ2, i, nPoints, AlCaHLTBitMon_ParallelJobs::p, PV3DBase< T, PVType, FrameType >::perp(), r, storage, z, and PV3DBase< T, PVType, FrameType >::z().

                                         : 
  storage(3*points.size()) {
  nPoints = points.size();
  r = &storage.front();
  z = r+nPoints;
  errZ2 = z+nPoints;
  for (int i=0; i!=nPoints; ++i) {
    const GlobalPoint & p = points[i];
    r[i] = p.perp();
    z[i] = p.z();
  }

  float simpleCot2 = ( z[nPoints-1]-z[0] )/ (r[nPoints-1] - r[0] );
  simpleCot2 *= simpleCot2;
  for (int i=0; i!=nPoints; ++i) {
    errZ2[i] = (isBarrel[i]) ? errors[i].czz() :  
      errors[i].rerr(points[i])  * simpleCot2;
  }
}

RZLine::RZLine	(	const std::vector< float > &	aR,
		const std::vector< float > &	aZ,
		const std::vector< float > &	aErrZ
	)

Definition at line 7 of file RZLine.cc.

References errZ2, i, nPoints, r, storage, and z.

                                           :
  storage(3*aR.size()) {
  nPoints = aR.size();
  r = &storage.front();
  z = r+nPoints;
  errZ2 = z+nPoints;
  for (int i=0; i<nPoints; i++) {
    r[i] = aR[i];
    z[i]=aZ[i];
    errZ2[i] = aErrZ[i]*aErrZ[i];
  } 
}

Member Function Documentation

float RZLine::chi2	(	float	cotTheta,
		float	intercept
	)		const

Definition at line 50 of file RZLine.cc.

References errZ2, i, nPoints, r, funct::sqr(), and z.

Referenced by PixelFitterByConformalMappingAndLine::run(), TrackFitter::run(), and PixelFitterByHelixProjections::run().

{
  float chi2 = 0.f;
  for (int i=0; i!=nPoints; ++i) chi2 += sqr( ((z[i]-intercept) - cotTheta*r[i]) ) / errZ2[i];
  return chi2;
}

void RZLine::fit	(	float &	cotTheta,
		float &	intercept,
		float &	covss,
		float &	covii,
		float &	covsi
	)		const

Definition at line 44 of file RZLine.cc.

References errZ2, linearFit(), nPoints, r, and z.

Referenced by PixelFitterByConformalMappingAndLine::run(), TrackFitter::run(), and PixelFitterByHelixProjections::run().

{
  linearFit( r, z, nPoints, errZ2, cotTheta, intercept, covss, covii, covsi);
}

Member Data Documentation

float * RZLine::errZ2

private

Definition at line 26 of file RZLine.h.

Referenced by chi2(), fit(), and RZLine().

int RZLine::nPoints

private

Definition at line 25 of file RZLine.h.

Referenced by chi2(), fit(), and RZLine().

float* RZLine::r

private

Definition at line 26 of file RZLine.h.

Referenced by chi2(), fit(), and RZLine().

std::vector<float> RZLine::storage

private

Definition at line 24 of file RZLine.h.

Referenced by RZLine().

float * RZLine::z

private

Definition at line 26 of file RZLine.h.

Referenced by chi2(), fit(), geometryXMLparser.Alignable::pos(), and RZLine().