Public Member Functions
void	new_val (T x)

double	mean () const

double	variance () const

double	std () const

Private Attributes
unsigned int	n = 0

double	mu = 0

double	var = 0

double	M = 0

Friends
std::istream &	operator>> (std::istream &input, stats_computer2 &stat)

Detailed Description

template<typename T>
class statistics::stats_computer2< T >

continuous mean and variance computance using Welford's algorithm (very accurate)

Definition at line 72 of file realtime_stats.cpp.

Member Function Documentation

◆ mean()

template<typename T >

double statistics::stats_computer2< T >::mean ( ) const

inline

return sample mean computed till last sample

Definition at line 86 of file realtime_stats.cpp.

86{ return mu; }

◆ new_val()

template<typename T >

void statistics::stats_computer2< T >::new_val ( T x )

inline

Constructor

Parameters

[in] x new data sample

Definition at line 77 of file realtime_stats.cpp.

                      {
        n++;
        double delta = x - mu;
        mu += delta / n;
        double delta2 = x - mu;
        M += delta * delta2;
    }

◆ std()

template<typename T >

double statistics::stats_computer2< T >::std ( ) const

inline

return sample standard deviation computed till last sample

Definition at line 92 of file realtime_stats.cpp.

92{ return std::sqrt(this->variance()); }

statistics::stats_computer2::variance

double variance() const

Definition realtime_stats.cpp:89

◆ variance()

template<typename T >

double statistics::stats_computer2< T >::variance ( ) const

inline

return data variance computed till last sample

Definition at line 89 of file realtime_stats.cpp.

89{ return M / n; }

Friends And Related Symbol Documentation

◆ operator>>

template<typename T >

std::istream & operator>>	(	std::istream &	input,
		stats_computer2< T > &	stat )

friend

short-hand operator to read new sample from input stream
e.g.: std::cin >> stats1;

Definition at line 97 of file realtime_stats.cpp.

                                                           {
        T val;
        input >> val;
        stat.new_val(val);
        return input;
    }