data structure More...

Public Member Functions
void	add (const AlignData &data)
	Merge another data structure to this one.

void	finalize (double scaleFact)
	Calculate weighted averages and rescale errors.

Public Attributes
int	iter = 0
	iteration counter

int	ntrk = 0
	number of tracks used

std::vector< float >	alignPars
	alignment parameters

std::vector< float >	alignErrs
	uncertainties on alignment parameters

bool	valid = false
	true if alignment parameters are valid

Detailed Description

data structure

Definition at line 52 of file TOPAlignmentAlgorithm.h.

Member Function Documentation

◆ add()

void add ( const AlignData & data )

Merge another data structure to this one.

Implements weighted average (least square fit) of alignment parameters. Function finalize() must be called after all data structures are added.

Definition at line 342 of file TOPAlignmentAlgorithm.cc.

    {
      iter = std::max(iter, data.iter);
      ntrk += data.ntrk;
      if (not data.valid) return;
 
      for (size_t i = alignPars.size(); i < data.alignPars.size(); i++) {
        alignPars.push_back(0);
        alignErrs.push_back(0);
      }
 
      for (size_t i = 0; i < data.alignPars.size(); i++) {
        auto e = data.alignErrs[i];
        if (e == 0) continue;
        auto wt = 1 / (e * e);
        alignPars[i] += data.alignPars[i] * wt ;
        alignErrs[i] += wt ;
      }
      valid = true;
    }

◆ finalize()

void finalize ( double scaleFact )

Calculate weighted averages and rescale errors.

Parameters

scaleFact scale factor for errors

Definition at line 364 of file TOPAlignmentAlgorithm.cc.

    {
      for (size_t i = 0; i < alignPars.size(); i++) {
        auto wt = alignErrs[i];
        if (wt == 0) continue;
        alignPars[i] /= wt;
        alignErrs[i] = 1 / sqrt(wt) * scaleFact;
      }
    }

Member Data Documentation

◆ alignErrs

std::vector<float> alignErrs

uncertainties on alignment parameters

Definition at line 56 of file TOPAlignmentAlgorithm.h.

◆ alignPars

std::vector<float> alignPars

alignment parameters

Definition at line 55 of file TOPAlignmentAlgorithm.h.

◆ iter

int iter = 0

iteration counter

Definition at line 53 of file TOPAlignmentAlgorithm.h.

◆ ntrk

int ntrk = 0

number of tracks used

Definition at line 54 of file TOPAlignmentAlgorithm.h.

◆ valid

bool valid = false

true if alignment parameters are valid

Definition at line 57 of file TOPAlignmentAlgorithm.h.

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

top/calibration/include/TOPAlignmentAlgorithm.h
top/calibration/src/TOPAlignmentAlgorithm.cc

Public Member Functions

Public Attributes