sndSciFiTools.cxx File Reference

#include "sndSciFiTools.h"
#include <numeric>
#include <algorithm>
#include "TH1F.h"
#include "FairLogger.h"
#include "TClonesArray.h"
#include "sndScifiHit.h"
#include "ROOT/TSeq.hxx"
#include "Scifi.h"
#include "TROOT.h"
#include "ROOT/RRangeCast.hxx"

Include dependency graph for sndSciFiTools.cxx:

Go to the source code of this file.

Functions
bool	validateHit (sndScifiHit *aHit, int ref_station, bool ref_orientation)
double	computeMean (const std::vector< double > &values)
double	hitWeightComputation (std::vector< double > hit_position)

Function Documentation

computeMean()

double computeMean

(

const std::vector< double > &

values

)

Definition at line 566 of file sndSciFiTools.cxx.

{
   double sum = std::accumulate(values.begin(), values.end(), 0.0);
   double mean = sum / values.size();
   return mean;
}

hitWeightComputation()

double hitWeightComputation

(

std::vector< double >

hit_position

)

Definition at line 636 of file sndSciFiTools.cxx.

                                                            {
    /* This function returns the summation of the hit weights 
    where a hit weight is the number of neighbouring hits within 1 cm position (default width).
 
    Arguments: 
        hit_position: A vector containing the positions of the hits in a specific SciFi station.
    
    Returns: 
        The sum of the weights of the hits in the vector.
        Returns 0 if the vector is empty or if the sum of weights is 0.
    */
 
    if (hit_position.empty()) {
        LOG(INFO) << "Warning: The hit position vector is empty." << std::endl;
        return 0; // Return 0 if the vector is empty
    }
 
    int n_hits = hit_position.size();
    double width = 1.0; // Width around the hit to consider as a neighbour, in cm
    std::vector<double> weights; // Vector to store the weights of each hit
 
    // Sorting the hits for efficient neighbour counting
    std::sort(hit_position.begin(), hit_position.end());
 
    // Initialize pointers for the sliding window.
    // Both pointers will only move forward (or stay put) across the outer loop iterations.
    int left_ptr = 0; 
    int right_ptr = 0; 
 
    // Loop through each hit position to calculate its neighbour count
    for (int i = 0; i < n_hits; i++) {
        double specific_hit = hit_position[i];
        
        // Move right_ptr forward to include all hits within (specific_hit + width).
        // It will point to the first element *just outside* the right boundary of the window.
        while (right_ptr < n_hits && hit_position[right_ptr] <= specific_hit + width) {
            right_ptr++;
        }
        
        // Move left_ptr forward to exclude all hits *less than* (specific_hit - width).
        // It will point to the first element *just inside* or at the left boundary of the window.
        while (left_ptr < n_hits && hit_position[left_ptr] < specific_hit - width) {
            left_ptr++;
        }
        
        // Calculate neighbouring hits within the window:
        // The number of hits in the current window is (right_ptr - left_ptr).
        // This count includes the 'specific_hit' itself.
        double count_in_window = right_ptr - left_ptr;
        
        // Subtract 1 to exclude the 'specific_hit' itself from the neighbour count.
        // We must ensure that 'specific_hit' (hit_position[i]) is actually within the window
        // defined by left_ptr and right_ptr. Since the array is sorted and we are iterating
        // through 'i', hit_position[i] will always be between hit_position[left_ptr] and 
        // hit_position[right_ptr-1] (if left_ptr <= i < right_ptr).
        double neighbour_no_of_hits = count_in_window - 1; 
 
        // Ensure the neighbour count is non-negative
        if (neighbour_no_of_hits < 0) {
            neighbour_no_of_hits = 0; 
        }
        
        weights.push_back(neighbour_no_of_hits);
    }
 
    // Calculate the sum of all computed weights
    double sum_weights = std::accumulate(weights.begin(), weights.end(), 0.0);
 
    return sum_weights;
}

validateHit()

bool validateHit	(	sndScifiHit *	aHit,
		int	ref_station,
		bool	ref_orientation
	)

Definition at line 108 of file sndSciFiTools.cxx.

{
 
   if (!(aHit->isValid())) {
      return false;
   }
   if (aHit->GetStation() != ref_station) {
      return false;
   }
   if (aHit->isVertical() != ref_orientation) {
      return false;
   }
 
   return true;
}