mrpt::math::CHistogram Class Reference

Detailed Description

This class provides an easy way of computing histograms for unidimensional real valued variables.

Call "getHistogram" or "getHistogramNormalized" to retrieve the full list of bin positions & hit counts.

Example:

CHistogram              hist(0,100,10);
hist.add(86);
hist.add(7);
hist.add(45);

std::cout << hist.getBinCount(0) << std::endl;          // Result: "1"
std::cout << hist.getBinRatio(0) << std::endl;          // Result: "0.33"

Definition at line 35 of file CHistogram.h.

#include <mrpt/math/CHistogram.h>

Public Member Functions
	CHistogram (const double min, const double max, const size_t nBins)
	Constructor. More...
void	clear ()
	Clear the histogram: More...
void	add (const double x)
	Add an element to the histogram. More...
template<typename Derived >
void	add (const Eigen::MatrixBase< Derived > &x)
	Add all the elements from a MRPT container to the histogram. More...
template<typename T >
void	add (const std::vector< T > &x)
size_t	getBinCount (const size_t index) const
	Retuns the elements count into the selected bin index, where first one is 0. More...
double	getBinRatio (const size_t index) const
	Retuns the ratio in [0,1] range for the selected bin index, where first one is 0. More...
void	getHistogram (std::vector< double > &x, std::vector< double > &hits) const
	Returns the list of bin centers & hit counts. More...
void	getHistogramNormalized (std::vector< double > &x, std::vector< double > &hits) const
	Returns the list of bin centers & hit counts, normalized such as the integral of the histogram, interpreted as a density PDF, amounts to 1. More...

Static Public Member Functions
static CHistogram	createWithFixedWidth (double min, double max, double binWidth)
	Constructor with a fixed bin width. More...

Private Attributes
double	m_min
double	m_max
	The histogram limits. More...
double	m_binSizeInv
	((max-min)/nBins)^-1 More...
std::vector< size_t >	m_bins
	The bins counter. More...
size_t	m_count
	The total elements count. More...

Constructor & Destructor Documentation

CHistogram()

CHistogram::CHistogram	(	const double	min,
		const double	max,
		const size_t	nBins
	)

Constructor.

Exceptions

std::exception

On nBins<=0 or max<=min

Definition at line 22 of file CHistogram.cpp.

References ASSERT_, m_binSizeInv, m_max, m_min, and min.

Member Function Documentation

add() [1/3]

void CHistogram::add

(

const double

x

)

Add an element to the histogram.

If element is out of [min,max] it is ignored.

Definition at line 42 of file CHistogram.cpp.

References ASSERT_, m_bins, m_binSizeInv, m_count, m_max, and m_min.

Referenced by mrpt::math::CMonteCarlo< T, NUM, OTHER >::CStatisticalAnalyzer::getDistribution(), mrpt::math::histogram(), and TEST().

add() [2/3]

template<typename Derived >

void mrpt::math::CHistogram::add ( const Eigen::MatrixBase< Derived > &  x )

inline

Add all the elements from a MRPT container to the histogram.

If an element is out of [min,max] it is ignored.

Definition at line 67 of file CHistogram.h.

add() [3/3]

template<typename T >

void mrpt::math::CHistogram::add ( const std::vector< T > &  x )

inline

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Definition at line 76 of file CHistogram.h.

clear()

void CHistogram::clear

(

)

Clear the histogram:

Definition at line 33 of file CHistogram.cpp.

References m_bins, and m_count.

createWithFixedWidth()

static CHistogram mrpt::math::CHistogram::createWithFixedWidth ( double  min, double  max, double  binWidth  )

inlinestatic

Constructor with a fixed bin width.

Exceptions

std::exception

On max<=min or width<=0

Definition at line 52 of file CHistogram.h.

References ASSERT_, and min.

Referenced by mrpt::math::CMonteCarlo< T, NUM, OTHER >::CStatisticalAnalyzer::getDistribution().

getBinCount()

size_t CHistogram::getBinCount

(

const size_t

index

)

const

Retuns the elements count into the selected bin index, where first one is 0.

Exceptions

std::exception

On invalid index

Definition at line 57 of file CHistogram.cpp.

References m_bins, and THROW_EXCEPTION.

getBinRatio()

double CHistogram::getBinRatio

(

const size_t

index

)

const

Retuns the ratio in [0,1] range for the selected bin index, where first one is 0.

It returns 0 if no elements have been added.

Exceptions

std::exception

On invalid index.

Definition at line 67 of file CHistogram.cpp.

References m_bins, m_count, and THROW_EXCEPTION.

getHistogram()

void CHistogram::getHistogram	(	std::vector< double > &	x,
		std::vector< double > &	hits
	)		const

Returns the list of bin centers & hit counts.

See also

getHistogramNormalized

Definition at line 78 of file CHistogram.cpp.

References mrpt::math::linspace(), m_bins, m_max, and m_min.

Referenced by mrpt::math::histogram(), and TEST().

getHistogramNormalized()

void CHistogram::getHistogramNormalized	(	std::vector< double > &	x,
		std::vector< double > &	hits
	)		const

Returns the list of bin centers & hit counts, normalized such as the integral of the histogram, interpreted as a density PDF, amounts to 1.

See also

getHistogram

Definition at line 90 of file CHistogram.cpp.

References mrpt::math::linspace(), m_bins, m_binSizeInv, m_count, m_max, and m_min.

Referenced by mrpt::math::histogram().

Member Data Documentation

m_bins

std::vector<size_t> mrpt::math::CHistogram::m_bins

private

The bins counter.

Definition at line 40 of file CHistogram.h.

Referenced by add(), clear(), getBinCount(), getBinRatio(), getHistogram(), and getHistogramNormalized().

m_binSizeInv

double mrpt::math::CHistogram::m_binSizeInv

private

((max-min)/nBins)^-1

Definition at line 39 of file CHistogram.h.

Referenced by add(), CHistogram(), and getHistogramNormalized().

m_count

size_t mrpt::math::CHistogram::m_count

private

The total elements count.

Definition at line 41 of file CHistogram.h.

Referenced by add(), clear(), getBinRatio(), and getHistogramNormalized().

m_max

double mrpt::math::CHistogram::m_max

private

The histogram limits.

Definition at line 38 of file CHistogram.h.

Referenced by add(), CHistogram(), getHistogram(), and getHistogramNormalized().

m_min

double mrpt::math::CHistogram::m_min

private

Definition at line 38 of file CHistogram.h.

Referenced by add(), CHistogram(), getHistogram(), and getHistogramNormalized().