JCALIBRATE::JHVInterpolator Struct Reference

Auxiliary data structure to store high-voltage versus gain data and interpolate the nominal high-voltage. More...

#include <JHVInterpolator.hh>

Public Member Functions
	JHVInterpolator (TMultiGraph &object)
	Constructor. More...
void	AddPoint (Double_t HV, Double_t gain, Double_t gainError)
	Add point to diagram. More...
void	SetPoint (Int_t i, Double_t HV, Double_t gain, Double_t gainError)
	Set point with index i. More...
const bool	checkHV (const double HV) const
	Checks whether high-voltage is within range. More...
const bool	checkHV (const double HV1, const double HV2) const
	Checks whether two high-voltage values are different. More...
const bool	checkGain (const double gain) const
	Checks if gain is within range. More...
const bool	areIncreasing (const Int_t i, const Int_t j)
	Checks whether the gains of two points are strictly increasing as function of their absolute high-voltage. More...
const bool	areValid (const Int_t i, const Int_t j)
	Checks whether two points are valid for inter-/extrapolation. More...
bool	interpolate (const double gainTarget)
	Inter-/Extrapolate the high-voltage value corresponding to the target gain value. More...
double	getTargetHV (const double gainTarget)
	Get high-voltage corresponding to given target gain value. More...
double	getTargetHVError (const double gainTarget)
	Get error estimate on high-voltage corresponding to given target gain value. More...
TGraphErrors *	getData ()
	Get graph with the input data for the interpolation. More...
TGraphErrors *	getResult ()
	Get graph with the interpolation result. More...

Static Public Member Functions
static void	setMinHVDistance (const double minDist)
	Set minimal separation distance for high-voltage. More...
static void	setHVRange (const JRange< double > range)
	Set valid gain range. More...
static void	setGainRange (const JRange< double > range)
	Set valid gain range. More...

Private Attributes
TMultiGraph *	data
	HV-versus-gain data. More...

Static Private Attributes
static double	dHVmin = 2 * 3.14
	Minimal high-voltage difference between two points [V]. More...
static JRange< double >	hvRange = JRange<double>(-1500, -80)
	Allowed high-voltage range [V]. More...
static JRange< double >	gainRange
	Allowed gain range. More...

Detailed Description

Auxiliary data structure to store high-voltage versus gain data and interpolate the nominal high-voltage.

Definition at line 35 of file JHVInterpolator.hh.

Constructor & Destructor Documentation

JCALIBRATE::JHVInterpolator::JHVInterpolator ( TMultiGraph &  object )

inline

Constructor.

Parameters

object

TMultiGraph object

Definition at line 42 of file JHVInterpolator.hh.

                                         :
      data(&object)
    {}

Member Function Documentation

void JCALIBRATE::JHVInterpolator::AddPoint ( Double_t  HV, Double_t  gain, Double_t  gainError  )

inline

Add point to diagram.

Parameters

HV	high-voltage [V]
gain	gain value
gainError	error on gain value

Definition at line 54 of file JHVInterpolator.hh.

    {
      TGraphErrors* g1 = getData();
      
      const Int_t   N  = g1->GetN();

      g1->SetPoint     (N, fabs(HV), gain);
      g1->SetPointError(N, 0.0, gainError);
    }

void JCALIBRATE::JHVInterpolator::SetPoint ( Int_t  i, Double_t  HV, Double_t  gain, Double_t  gainError  )

inline

Set point with index i.

Parameters

i	index of point
HV	high-voltage [V]
gain	gain value
gainError	error on gain value

Definition at line 73 of file JHVInterpolator.hh.

    {
      TGraphErrors* g1 = getData();

      g1->SetPoint     (i, fabs(HV), gain);
      g1->SetPointError(i, 0.0, gainError);
    }

const bool JCALIBRATE::JHVInterpolator::checkHV ( const double  HV ) const

inline

Checks whether high-voltage is within range.

Parameters

HV	high-voltage [V]

Returns

true if high-voltage is within range; else false

Definition at line 88 of file JHVInterpolator.hh.

    {
      return (HV > hvRange.getLowerLimit() &&
              HV < hvRange.getUpperLimit());
    }

const bool JCALIBRATE::JHVInterpolator::checkHV ( const double  HV1, const double  HV2  ) const

inline

Checks whether two high-voltage values are different.

Parameters

HV1	first high-voltage [V]
HV2	second high-voltage [V]

Returns

true if absolute difference is greater than minimal required difference; else false

Definition at line 102 of file JHVInterpolator.hh.

    {
      return (fabs(HV1 - HV2) > dHVmin);
    }

const bool JCALIBRATE::JHVInterpolator::checkGain ( const double  gain ) const

inline

Checks if gain is within range.

Parameters

gain	gain value

Returns

true if gain within allowed range; else false

Definition at line 114 of file JHVInterpolator.hh.

    {
      return (gain > gainRange.getLowerLimit() &&
              gain < gainRange.getUpperLimit());
    }

const bool JCALIBRATE::JHVInterpolator::areIncreasing ( const Int_t  i, const Int_t  j  )

inline

Checks whether the gains of two points are strictly increasing as function of their absolute high-voltage.

Parameters

i	index of first point
j	index of second point

Returns

true if gains of given points are strictly increasing
as function of the absolute high-voltage; else false

Definition at line 129 of file JHVInterpolator.hh.

    {
      TGraphErrors* g1 = getData();
      
      if ((i >= 0 && i < g1->GetN()) &&
          (j >= 0 && i < g1->GetN())) {
          
        return ((g1->GetPointX(i) > g1->GetPointX(j) && g1->GetPointY(i) > g1->GetPointY(j)) ||
                (g1->GetPointX(i) < g1->GetPointX(j) && g1->GetPointY(i) < g1->GetPointY(j)));
        
      } else {

        return false;
      }
    }

const bool JCALIBRATE::JHVInterpolator::areValid ( const Int_t  i, const Int_t  j  )

inline

Checks whether two points are valid for inter-/extrapolation.

Parameters

i	index of first point
j	index of second point

Returns

true if valid for inter-/extrapolation; else false

Definition at line 153 of file JHVInterpolator.hh.

    {
      TGraphErrors* g1 = getData();
      
      if ((i >= 0 && i < g1->GetN()) &&
          (j >= 0 && i < g1->GetN())) {

        const double HV_i   = -fabs(g1->GetPointX(i));
        const double HV_j   = -fabs(g1->GetPointX(j));
        const double gain_i =       g1->GetPointY(i);
        const double gain_j =       g1->GetPointY(j);
        
        return (areIncreasing(   i,    j) && checkHV(HV_i) && checkGain(gain_i) &&
                checkHV      (HV_i, HV_j) && checkHV(HV_j) && checkGain(gain_j));
        
      } else {
        
        return false;
      }
    }

bool JCALIBRATE::JHVInterpolator::interpolate ( const double  gainTarget )

inline

Inter-/Extrapolate the high-voltage value corresponding to the target gain value.

Parameters

gainTarget

target gain value for inter-/extrapolation

Returns

true if inter-/extrapolation successful; else false

Definition at line 181 of file JHVInterpolator.hh.

    {
      TGraphErrors* g1 = getData();
      
      if (g1->GetN() < 2 || !checkGain(gainTarget)) {
        return false;
      }
      
      // Search for valid inter-/extrapolation points
      
      Int_t i = 0;
      Int_t j = 1;

      for (Int_t k = 1; k < g1->GetN(); ++k) {

        const double dGain_i = fabs(g1->GetPointY(i) - gainTarget);
        const double dGain_j = fabs(g1->GetPointY(j) - gainTarget);     
        const double dGain_k = fabs(g1->GetPointY(k) - gainTarget);
        
        if         (dGain_k < dGain_i) {
          
          j = (areValid(i, k) ? i : j);
          i = k;
          
        } else if ((dGain_k < dGain_j || !areValid(i, j)) &&
                   areValid(i, k)) {
          j = k;
        }
      }

      // Inter-/Extrapolate high-voltage corresponding to given gain
      
      if (areValid(i, j)) {
        
        const double logHV0 = log(fabs(g1->GetPointX(i)));
        const double logHV1 = log(fabs(g1->GetPointX(j)));
        
        const double logG0  = log(g1->GetPointY(i));
        const double logG1  = log(g1->GetPointY(j));
        const double elogG0 = g1->GetErrorY(i) / g1->GetPointY(i);
        const double elogG1 = g1->GetErrorY(j) / g1->GetPointY(j);
        
        const double dlogG0 = log(gainTarget) - logG0;
        const double dlogG1 = log(gainTarget) - logG1;
        
        const double slope  = (logG1 - logG0) / (logHV1 - logHV0);
        
        const double HVnom  = exp(dlogG0 / slope + logHV0);
        const double eHVnom = HVnom * sqrt(dlogG1 * dlogG1 * elogG0 * elogG0 +
                                           dlogG0 * dlogG0 * elogG1 * elogG1) / fabs(slope * (logG1 - logG0));
        
        const        double distance = fabs((log(HVnom) - logHV0) / (logHV0 - logHV1));
        static const double maxDist  = 2.0;
        
        if (checkHV(-HVnom) && distance < maxDist) {
          
          TGraphErrors* g0 = getResult();
          
          g0->SetPoint     (0,  HVnom, gainTarget);
          g0->SetPointError(0, eHVnom,        0.0);
          
          return true;
        }
      }
      
      return false;
    }

double JCALIBRATE::JHVInterpolator::getTargetHV ( const double  gainTarget )

inline

Get high-voltage corresponding to given target gain value.

Parameters

gainTarget

target gain value for inter-/extrapolation

Returns

inter-/extrapolated high-voltage
corresponding to target gain value [V]

Definition at line 257 of file JHVInterpolator.hh.

    {
      static const double precision = 1e-3;
      
      TGraphErrors* g0 = getResult();
      
      if ((g0->GetN() > 0 && fabs(g0->GetPointY(0) - gainTarget) < precision) || interpolate(gainTarget)) {
        
        return g0->GetPointX(0);
        
      } else {

        THROW(JValueOutOfRange, "JHVInterpolator::getTargetError(): No valid inter-/extrapolation candidate found for given target gain of " << gainTarget << '.');
      }
    }

double JCALIBRATE::JHVInterpolator::getTargetHVError ( const double  gainTarget )

inline

Get error estimate on high-voltage corresponding to given target gain value.

Parameters

gainTarget

target gain value for inter-/extrapolation

Returns

error on inter-/extrapolated high-voltage
corresponding to the target gain value [V]

Definition at line 281 of file JHVInterpolator.hh.

    {
      static const double precision = 1e-3;

      TGraphErrors* g0 = getResult();
      
      if ((g0->GetN() > 0 && fabs(g0->GetPointY(0) - gainTarget) < precision) || interpolate(gainTarget)) {

        return g0->GetErrorX(0);
        
      } else {

        THROW(JValueOutOfRange, "JHVInterpolator::getTargetError(): No valid inter-/extrapolation candidate found for given target gain of " << gainTarget << '.');             
      }
    }

TGraphErrors* JCALIBRATE::JHVInterpolator::getData ( )

inline

Get graph with the input data for the interpolation.

Returns

pointer to graph with input data

Definition at line 303 of file JHVInterpolator.hh.

    {
      TGraphErrors* g1;
      
      TList* list = data->GetListOfGraphs();

      if (list != NULL && list->FindObject(HVINTERPOLATOR_DATA) != NULL) {
        
        g1 = (TGraphErrors*)list->FindObject(HVINTERPOLATOR_DATA);
        
      } else {
        
        g1 = new TGraphErrors();
        
        g1->SetName(HVINTERPOLATOR_DATA);
        
        g1->SetMarkerStyle(kFullDotSmall);
        
        g1->Set(0);
        
        data->Add(g1);
      }
      
      return g1;
    }

TGraphErrors* JCALIBRATE::JHVInterpolator::getResult ( )

inline

Get graph with the interpolation result.

Returns

pointer to graph with the interpolation result

Definition at line 335 of file JHVInterpolator.hh.

    {
      TGraphErrors* g0;
      
      TList* list = data->GetListOfGraphs();

      if (list != NULL && list->FindObject(HVINTERPOLATOR_RESULT) != NULL) {
        
        g0 = (TGraphErrors*)list->FindObject(HVINTERPOLATOR_RESULT);
        
      } else {

        g0 = new TGraphErrors();

        g0->SetName(HVINTERPOLATOR_RESULT);
        
        g0->SetLineColor  (kRed);
        g0->SetMarkerColor(kRed);
        g0->SetMarkerStyle(kFullDotSmall);

        g0->Set(0);
        
        data->Add(g0);
      }

      return g0;
    }

static void JCALIBRATE::JHVInterpolator::setMinHVDistance ( const double  minDist )

inlinestatic

Set minimal separation distance for high-voltage.

Parameters

minDist

minimal separation distance for high-voltage

Definition at line 369 of file JHVInterpolator.hh.

    {
      dHVmin = minDist;
    }

static void JCALIBRATE::JHVInterpolator::setHVRange ( const JRange< double >  range )

inlinestatic

Set valid gain range.

Parameters

range

valid high-voltage range [V]

Definition at line 380 of file JHVInterpolator.hh.

    {
      hvRange = range;
    }

static void JCALIBRATE::JHVInterpolator::setGainRange ( const JRange< double >  range )

inlinestatic

Set valid gain range.

Parameters

range

valid gain range

Definition at line 391 of file JHVInterpolator.hh.

    {
      gainRange = range;
    }

Member Data Documentation

TMultiGraph* JCALIBRATE::JHVInterpolator::data

private

HV-versus-gain data.

Definition at line 399 of file JHVInterpolator.hh.

double JCALIBRATE::JHVInterpolator::dHVmin = 2 * 3.14

staticprivate

Minimal high-voltage difference between two points [V].

Default values.

Definition at line 401 of file JHVInterpolator.hh.

JRange< double > JCALIBRATE::JHVInterpolator::hvRange = JRange<double>(-1500, -80)

staticprivate

Allowed high-voltage range [V].

Definition at line 402 of file JHVInterpolator.hh.

JRange< double > JCALIBRATE::JHVInterpolator::gainRange

staticprivate

Initial value:

= JRange<double>(FITTOT_GAIN_MIN,
                                                             FITTOT_GAIN_MAX)

Allowed gain range.

Definition at line 403 of file JHVInterpolator.hh.

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

• JHVInterpolator.hh