polynomial Core as used for the weibull function More...

#include <core.h>

Inheritance diagram for polyCore:

Public Member Functions
	polyCore (const PsiData *data=NULL, const int sigmoid=1, const double alpha=0.1)
	construcor
	polyCore (const polyCore &original)
	copy constructor
double	g (double x, const std::vector< double > &prm) const
	evaluate the polyCore
double	dg (double x, const std::vector< double > &prm, int i) const
	derivative of the polyCore with respect to a parameter
double	dgx (double x, const std::vector< double > &prm) const
	evaluate the first derivative of the core with respect to stimulus intensity
double	ddg (double x, const std::vector< double > &prm, int i, int j) const
	2nd derivative of the polyCore object with respect to parameters
double	inv (double y, const std::vector< double > &prm) const
	inverse of the core
double	dinv (double y, const std::vector< double > &prm, int i) const
	derivative of the inverse core
std::vector< double >	transform (int nprm, double a, double b) const
	transform the parameter from a logistic regression model to starting values
PsiCore *	clone (void) const
	clone object by value
Static Public Member Functions
static std::string	getDescriptor (void)
	get a short string that identifies the type of core

Detailed Description

polynomial Core as used for the weibull function

The classical weibull function is parameterized as 1-exp(-(x/alpha)^beta), this core defines the (x/alpha)^beta part in this parameterization. The PsiExponential sigmoid gives the 1-exp(-.) part.

Constructor & Destructor Documentation

polyCore::polyCore	(	const PsiData *	data = `NULL`,
		const int	sigmoid = `1`,
		const double	alpha = `0.1`
	)

construcor

Parameters:

	data	use a data set to determine the correct scaling factors of initial values and initialize the objec
	sigmoid	ignored
	alpha	ignored

Member Function Documentation

double polyCore::ddg	(	double	x,
		const std::vector< double > &	prm,
		int	i,
		int	j
	)			const `[virtual]`

2nd derivative of the polyCore object with respect to parameters

Parameters:

	x	stimulus intensity
	prm	parameter vector
	i	index of the first derivative parameter
	j	index of the 2nd derivatibe parameter

Reimplemented from PsiCore.

double polyCore::dg	(	double	x,
		const std::vector< double > &	prm,
		int	i
	)			const `[virtual]`

derivative of the polyCore with respect to a parameter

Parameters:

	x	stimulus intensity
	prm	parameter vector
	i	index of the parameter to which the derivative should be evaluated

Reimplemented from PsiCore.

double polyCore::dgx	(	double	x,
		const std::vector< double > &	prm
	)			const `[virtual]`

evaluate the first derivative of the core with respect to stimulus intensity

Parameters:

	x	stimulus intensity
	prm	parameter vector

Reimplemented from PsiCore.

double polyCore::dinv	(	double	y,
		const std::vector< double > &	prm,
		int	i
	)			const `[virtual]`

derivative of the inverse core

Parameters:

	y	value at which to evaluate the inverse
	prm	parameter vector
	i	index of the parameter for which the derivative should be evaluated

Reimplemented from PsiCore.

double polyCore::g	(	double	x,
		const std::vector< double > &	prm
	)			const `[inline, virtual]`

evaluate the polyCore

Parameters:

	x	stimulus intensity
	prm	parameter vector (alpha,beta, ...)

Reimplemented from PsiCore.

double polyCore::inv	(	double	y,
		const std::vector< double > &	prm
	)			const `[virtual]`

inverse of the core

Parameters:

	y	value for which the core should be inverted
	prm	parameter vector

Reimplemented from PsiCore.

std::vector< double > polyCore::transform	(	int	nprm,
		double	a,
		double	b
	)			const `[virtual]`

transform the parameter from a logistic regression model to starting values

Parameters:

	nprm	number of parameters in the final model
	a	intercept of the logistic regression model
	b	slope of the logistic regression model to starting values

Reimplemented from PsiCore.

The documentation for this class was generated from the following files:

src/core.h
src/core.cc

polyCore Class Reference

Public Member Functions

Static Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation