TOPAlignmentAlgorithm::AlignData Struct Reference

data structure More...

Collaboration diagram for TOPAlignmentAlgorithm::AlignData:

Public Member Functions
void	add (const AlignData &data)
	Merge another data structure to this one. More...
void	finalize (double scaleFact)
	Calculate weighted averages and rescale errors. More...

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 64 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 345 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 367 of file TOPAlignmentAlgorithm.cc.

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

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