CDCDedxCosineCor Class Reference

dE/dx wire gain calibration constants More...

#include <CDCDedxCosineCor.h>

Inheritance diagram for CDCDedxCosineCor:

Public Member Functions
	CDCDedxCosineCor ()
	Default constructor.
	CDCDedxCosineCor (const std::vector< double > &cosgains)
	Constructor.
	~CDCDedxCosineCor ()
	Destructor.
CDCDedxCosineCor &	operator*= (CDCDedxCosineCor const &rhs)
	Combine payloads.
unsigned int	getSize () const
	Get the number of bins for the cosine correction.
const std::vector< double > &	getCosCor () const
	Get the calibration constants.
void	setCosCor (unsigned int bin, double value)
	Set the cosine correction.
double	getMean (unsigned int bin) const
	Return dE/dx mean value for the given bin.
double	getMean (double costh) const
	Return dE/dx mean value for given cos(theta)

Private Member Functions
	ClassDef (CDCDedxCosineCor, 8)
	ClassDef.

Private Attributes
std::vector< double >	m_cosgains
	dE/dx gains in cos(theta) bins

Detailed Description

dE/dx wire gain calibration constants

Definition at line 26 of file CDCDedxCosineCor.h.

Constructor & Destructor Documentation

CDCDedxCosineCor() [1/2]

CDCDedxCosineCor ( )

inline

Default constructor.

Definition at line 33 of file CDCDedxCosineCor.h.

: m_cosgains() {};

CDCDedxCosineCor() [2/2]

CDCDedxCosineCor ( const std::vector< double > & cosgains )

inlineexplicit

Constructor.

Parameters

cosgains

vector of calibration constants

Definition at line 39 of file CDCDedxCosineCor.h.

: m_cosgains(cosgains) {};

~CDCDedxCosineCor()

~CDCDedxCosineCor ( )

inline

Destructor.

Definition at line 44 of file CDCDedxCosineCor.h.

{};

Member Function Documentation

getCosCor()

const std::vector< double > & getCosCor ( ) const

inline

Get the calibration constants.

Returns

calibration constants

Definition at line 73 of file CDCDedxCosineCor.h.

{return m_cosgains; };

getMean() [1/2]

double getMean ( double costh ) const

inline

Return dE/dx mean value for given cos(theta)

Parameters

costh

for const with costh theta value

Returns

mean value

Definition at line 102 of file CDCDedxCosineCor.h.

    {
      if (std::abs(costh) > 1) return 0;
 
      // gains are stored at the center of the bins
      // find the bin center immediately preceding this value of costh
      double binsize = 2.0 / m_cosgains.size();
      int bin = std::floor((costh - 0.5 * binsize + 1.0) / binsize);
 
      // extrapolation
      // extrapolate backward for lowest half-bin and center positive half-bin
      // extrapolate forward for highest half-bin and center negative half-bin
      int thisbin = bin, nextbin = bin + 1;
      if ((costh + 1) < (binsize / 2) || (costh > 0 && std::fabs(costh) < (binsize / 2))) {
        thisbin = bin + 1; nextbin = bin + 2;
      } else {
        if ((costh - 1) > -1.0 * (binsize / 2) || (costh < 0 && std::fabs(costh) < (binsize / 2))) {
          thisbin = bin - 1; nextbin = bin;
        }
      }
      double frac = ((costh - 0.5 * binsize + 1.0) / binsize) - thisbin;
 
      if (thisbin < 0 || (unsigned)nextbin >= m_cosgains.size()) {
        B2WARNING("Problem with extrapolation of CDC dE/dx cosine correction");
        return 1.0;
      }
      return ((m_cosgains[nextbin] - m_cosgains[thisbin]) * frac + m_cosgains[thisbin]);
    };

getMean() [2/2]

double getMean ( unsigned int bin ) const

inline

Return dE/dx mean value for the given bin.

Parameters

bin	for const with cosine bin

Returns

mean value

Definition at line 91 of file CDCDedxCosineCor.h.

    {
      if (bin < m_cosgains.size()) return m_cosgains[bin];
      return 1.0;
    }

getSize()

unsigned int getSize ( ) const

inline

Get the number of bins for the cosine correction.

Returns

number of bins

Definition at line 67 of file CDCDedxCosineCor.h.

{ return m_cosgains.size(); };

operator*=()

CDCDedxCosineCor & operator*= ( CDCDedxCosineCor const & rhs )

inline

Combine payloads.

Definition at line 49 of file CDCDedxCosineCor.h.

    {
      if (m_cosgains.size() % rhs.getSize() != 0) {
        B2WARNING("Cosine gain parameters do not match, cannot merge!");
        return *this;
      }
      std::vector<double> rhsgains = rhs.getCosCor();
      int scale = std::floor(m_cosgains.size() / rhs.getSize() + 0.001);
      for (unsigned int bin = 0; bin < m_cosgains.size(); ++bin) {
        m_cosgains[bin] *= rhsgains[std::floor(bin / scale + 0.001)];
      }
      return *this;
    }

setCosCor()

void setCosCor ( unsigned int bin, double value )

inline

Set the cosine correction.

Parameters

bin	bin number
value	value to be set

Definition at line 80 of file CDCDedxCosineCor.h.

    {
      if (bin < m_cosgains.size()) m_cosgains[bin] = value;
      else B2ERROR("CDCDedxCosineCor: invalid bin number, value not set");
    }

Member Data Documentation

m_cosgains

std::vector<double> m_cosgains

private

dE/dx gains in cos(theta) bins

Definition at line 132 of file CDCDedxCosineCor.h.

---

The documentation for this class was generated from the following file:

• cdc/dbobjects/include/CDCDedxCosineCor.h