mln::accu::stat::variance< T, S, R > Struct Template Reference
[On values]

Variance accumulator class. More...

#include <variance.hh>

Inherits mln::accu::internal::base< R, mln::accu::stat::variance< T, S, R > >.

List of all members.

Public Member Functions
bool	is_valid () const
	Check whether this accu is able to return a result.
R	mean () const
	Get the mean value.
unsigned	n_items () const
	Get the number of items.
R	standard_deviation () const
	Get the standard deviation value.
S	sum () const
	Get the sum value.
template<typename T>
void	take_n_times (unsigned n, const T &t)
	Take n times the value t.
R	to_result () const
	Get the accumulator result (the variance value).
R	var () const
	Get the variance value.
void	init ()
	Manipulators.
void	take_as_init (const argument &t)
	Take as initialization the value t.

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Detailed Description

template<typename T, typename S = typename mln::value::props< T >::sum, typename R = S>
struct mln::accu::stat::variance< T, S, R >

Variance accumulator class.

Parameter T is the type of values that we sum. Parameter S is the type to store the value sum and the sum of value * value; the default type of S is the summation type (property) of T. Parameter R is the type of the mean and variance values; the default type of R is S.

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Member Function Documentation

template<typename T, typename S, typename R>

void mln::accu::stat::variance< T, S, R >::init

(

)

[inline]

Manipulators.

template<typename T, typename S, typename R>

bool mln::accu::stat::variance< T, S, R >::is_valid

(

)

const [inline]

Check whether this accu is able to return a result.

Always true here.

template<typename T, typename S, typename R>

R mln::accu::stat::variance< T, S, R >::mean

(

)

const [inline]

Get the mean value.

template<typename T, typename S, typename R>

unsigned mln::accu::stat::variance< T, S, R >::n_items

(

)

const [inline]

Get the number of items.

template<typename T, typename S, typename R>

R mln::accu::stat::variance< T, S, R >::standard_deviation

(

)

const [inline]

Get the standard deviation value.

References mln::accu::stat::variance< T, S, R >::to_result().

template<typename T, typename S, typename R>

S mln::accu::stat::variance< T, S, R >::sum

(

)

const [inline]

Get the sum value.

template<typename T, typename S, typename R>

void mln::accu::stat::variance< T, S, R >::take_as_init

(

const argument &

t

)

[inline]

Take as initialization the value t.

Dev note: this is a final method; override if needed by take_as_init_ (ending with '_').

Reimplemented from mln::Accumulator< E >.

template<typename E>

template<typename T>

void mln::Accumulator< E >::take_n_times	(	unsigned	n,
		const T &	t
	)			[inline, inherited]

Take n times the value t.

Dev note: this is a final method; override if needed by take_as_init_ (ending with '_').

References mln::mln_exact().

template<typename T, typename S, typename R>

R mln::accu::stat::variance< T, S, R >::to_result

(

)

const [inline]

Get the accumulator result (the variance value).

Referenced by mln::accu::stat::variance< T, S, R >::standard_deviation(), and mln::accu::stat::variance< T, S, R >::var().

template<typename T, typename S, typename R>

R mln::accu::stat::variance< T, S, R >::var

(

)

const [inline]

Get the variance value.

References mln::accu::stat::variance< T, S, R >::to_result().