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GLAST/LAT > DAQ and FSW > FSW > Doxygen Index > GRBP / V0-2-0

Constituent: grbpsiu     Tag: sun-gcc

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GRBP_cluster.c File Reference

GRB clustering. More...

#include "GRBP_cluster.h"
#include "GRBP_cache.h"
#include "GRBP_bitList.h"
#include <float.h>

Include dependency graph for GRBP_cluster.c:

Defines
#define	report_prms(_min_idx,_max_idx,_max,_pdists,_hi_pdists, _lo_pdists,_pdts,_hi_pdts,_lo_pdts,_j,_logP_sum,_threshold)
#define	report_masks(_title, _masks, _nmasks)
Functions
static __inline void	masksFill (unsigned int *masks, unsigned int nrange, const GRBP_neighborList *nl, int beg, int end, int max)
	Creates a bit mask representation of the photons in the neighbor list.
int	GRBP_clusterGammasFill (const GRBP_cluster *clusters, int beg, int end, int max, const unsigned short int *list, int cnt, double contrast, double threshold, unsigned int *masks, int nbits, GRBP_probabilityLogs *plog_max)
	Scans the circular list of clusters looking for clusters that are over the probability threshold. A list of photons that are members of such clusters is accumulated (in the form of a bit list) and returned in masks.

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Detailed Description

GRB clustering.

Author:

JJRussell - russell@slac.stanford.edu

   CVS $Id: GRBP_cluster.c,v 1.3 2007/08/02 17:24:59 russell Exp $

The cluster is the object used to detect a GRB. It has almost no role in locating a GRB. It is really a pattern recognition object. Each input photon acts a the parent of a cluster. A cluster is formed around that parent photon by photons that are within a configurable angular distance from the parent. When a new photon arrives, the previous N photons are checked. When a new photon arrives, the oldest photon in the cluster is retired and replaced with the new photon. This continues until the parent photon itself is retired.

When a photon is added to the cluster, its probability of being within the specified angular distance and within the time (based on the background rate) is computed. The sum of all the spatial and temporal probabilities gives a measure of the likelihood that this photon and its neighbors are from a GRB.

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Function Documentation

int GRBP_clusterGammasFill (  const GRBP_cluster *  clusters, int  beg, int  end, int  max, const unsigned short int *  list, int  cnt, double  contrast, double  threshold, unsigned int *  masks, int  nbits, GRBP_probabilityLogs *  plog_max )

Scans the circular list of clusters looking for clusters that are over the probability threshold. A list of photons that are members of such clusters is accumulated (in the form of a bit list) and returned in masks. { printf ("*\n") ; break; } { printf ("**\n"); break; } printf ("\n");

static __inline void masksFill (  unsigned int *  masks, unsigned int  nrange, const GRBP_neighborList *  nl, int  beg, int  end, int  max )  [static]

Creates a bit mask representation of the photons in the neighbor list. Parameters: masks  The array bit masks to fill nrange  The number of active bits in the bit mask nl  The list of neighbors beg  The index of the first neighbor in the neighbor list end  The index of the last neighbor in the neighbor list max  The size of the neighbor list. This determines the wrap- around point.

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