Statistic Class Reference
Statistic
#include <xstatistics.h>
Public Member Functions
void add (const float)
float average () const
void clear ()
uint32_t count () const
float maximum () const
float mean () const
float minimum () const
float pop_stdev () const
Statistic ()
float sum () const
float unbiased_stdev () const
float variance () const
Protected Attributes
uint32_t _cnt
float _max
float _min
float _ssqdif
float _sum
Detailed Description
Definition at line 46 of file xstatistics.h.
Constructor & Destructor Documentation
Statistic()
StatisticStatistic
StatisticStatistic
Statistic::Statistic ( )
Definition at line 3 of file xstatistics.cpp.
00004 {
00005 clear();
00006 }
Member Function Documentation
add()
addStatistic
Statisticadd
void Statistic::add (const float value)
Definition at line 23 of file xstatistics.cpp.
00024 {
00025 if (_cnt == 0)
00026 {
00027 _min = value;
00028 _max = value;
00029 }
00030 else
00031 {
00032 if (value < _min)
00033 _min = value;
00034 else if (value > _max)
00035 _max = value;
00036 }
00037 _sum += value;
00038 _cnt++;
00039
00040 #ifdef STAT_USE_STDEV
00041 if (_cnt > 1)
00042 {
00043 float _store = (_sum / _cnt - value);
00044 _ssqdif = _ssqdif + _cnt * _store * _store / (_cnt - 1);
00045 // ~10% faster but limits the amount of samples to 65K as _cnt*_cnt overflows
00046 // float _store = _sum - _cnt * value;
00047 // _ssqdif = _ssqdif + _store * _store / (_cnt*_cnt - _cnt);
00048 }
00049 #endif
00050 }
average()
averageStatistic
Statisticaverage
float Statistic::average ( ) const
Definition at line 53 of file xstatistics.cpp.
00054 {
00055 if (_cnt == 0)
00056 return NAN; // original code returned 0
00057 return _sum / _cnt;
00058 }
clear()
clearStatistic
Statisticclear
void Statistic::clear ( )
Definition at line 9 of file xstatistics.cpp.
00010 {
00011 _cnt = 0;
00012 _sum = 0;
00013 _min = 0;
00014 _max = 0;
00015 #ifdef STAT_USE_STDEV
00016 _ssqdif = 0.0; // not _ssq but sum of square differences
00017 // which is SUM(from i = 1 to N) of
00018 // (f(i)-_ave_N)**2
00019 #endif
00020 }
count()
countStatistic
Statisticcount
uint32_t Statistic::count ( ) const[inline]
Definition at line 54 of file xstatistics.h.
00054 { return _cnt; }; // zero if empty
maximum()
maximumStatistic
Statisticmaximum
float Statistic::maximum ( ) const[inline]
Definition at line 57 of file xstatistics.h.
00057 { return _max; }; // zero if empty
mean()
meanStatistic
Statisticmean
float Statistic::mean ( ) const
Definition at line 71 of file xstatistics.cpp.
00072 {
00073 if (_cnt == 0)
00074 return NAN; // otherwise DIV0 error
00075 return this->sum() / _cnt;
00076 }
minimum()
minimumStatistic
Statisticminimum
float Statistic::minimum ( ) const[inline]
Definition at line 56 of file xstatistics.h.
00056 { return _min; }; // zero if empty
pop_stdev()
pop_stdevStatistic
Statisticpop_stdev
float Statistic::pop_stdev ( ) const
Definition at line 78 of file xstatistics.cpp.
00079 {
00080 if (_cnt == 0)
00081 return NAN; // otherwise DIV0 error
00082 return sqrt(_ssqdif / _cnt);
00083 }
sum()
sumStatistic
Statisticsum
float Statistic::sum ( ) const[inline]
Definition at line 55 of file xstatistics.h.
00055 { return _sum; }; // zero if empty
unbiased_stdev()
unbiased_stdevStatistic
Statisticunbiased_stdev
float Statistic::unbiased_stdev ( ) const
Definition at line 85 of file xstatistics.cpp.
00086 {
00087 if (_cnt < 2)
00088 return NAN; // otherwise DIV0 error
00089 return sqrt(_ssqdif / (_cnt - 1));
00090 }
variance()
varianceStatistic
Statisticvariance
float Statistic::variance ( ) const
Definition at line 64 of file xstatistics.cpp.
00065 {
00066 if (_cnt == 0)
00067 return NAN; // otherwise DIV0 error
00068 return _ssqdif / _cnt;
00069 }
Member Data Documentation
_cnt
_cntStatistic
Statistic_cnt
uint32_t Statistic::_cnt[protected]
Definition at line 68 of file xstatistics.h.
_max
_maxStatistic
Statistic_max
float Statistic::_max[protected]
Definition at line 71 of file xstatistics.h.
_min
_minStatistic
Statistic_min
float Statistic::_min[protected]
Definition at line 70 of file xstatistics.h.
_ssqdif
_ssqdifStatistic
Statistic_ssqdif
float Statistic::_ssqdif[protected]
Definition at line 73 of file xstatistics.h.
_sum
_sumStatistic
Statistic_sum
float Statistic::_sum[protected]
Definition at line 69 of file xstatistics.h.
The documentation for this class was generated from the following files:
xstatistics.hxstatistics.cpp