IMP::core::TruncatedHarmonic< DIRECTION > Class Template Reference

A function that is harmonic over an interval. More...

#include <IMP/core/TruncatedHarmonic.h>

Inheritance diagram for IMP::core::TruncatedHarmonic< DIRECTION >:

Public Member Functions
	TruncatedHarmonic (Float center, Float k, Float threshold, Float limit)
	TruncatedHarmonic (Float center, Float k, Float threshold)
virtual double	evaluate (double feature) const
	Calculate score with respect to the given feature. More...
virtual DerivativePair	evaluate_with_derivative (double feature) const
	Calculate score and derivative with respect to the given feature. More...
virtual std::string	get_type_name () const
virtual ::IMP::base::VersionInfo	get_version_info () const
	Get information about the module and version of the object.
Public Member Functions inherited from IMP::kernel::UnaryFunction
	UnaryFunction (std::string name="UnaryFunction%1%")
Public Member Functions inherited from IMP::base::Object
virtual void	clear_caches ()
virtual void	do_destroy ()
CheckLevel	get_check_level () const
LogLevel	get_log_level () const
void	set_check_level (CheckLevel l)
void	set_log_level (LogLevel l)
	Set the logging level used in this object. More...
void	set_was_used (bool tf) const
void	show (std::ostream &out=std::cout) const
const std::string &	get_name () const
void	set_name (std::string name)

Additional Inherited Members
Protected Member Functions inherited from IMP::base::Object
	Object (std::string name)
	Construct an object with the given name. More...

Detailed Description

template<int DIRECTION>
class IMP::core::TruncatedHarmonic< DIRECTION >

This function is harmonic between center and threshold and then asymptotically converges to the limit value.

The function form above the threshold is currently limit-b/(x-o) where x is the offset from the center and b,o are constants chosen to make the function smooth and continuous. This form may change without notice unless someone tells us it is important that it does not.

Parameters

[in]

DIRECTION

Whether to be an upper bound, lower bound, or both directions. It should be one of the BoundDirection enum values. If it is LOWER, than the function is 0 for all values above the passed center.

See Also

Harmonic

HarmonicLowerBound

HarmonicUpperBound

Definition at line 43 of file TruncatedHarmonic.h.

Constructor & Destructor Documentation

template<int DIRECTION>

IMP::core::TruncatedHarmonic< DIRECTION >::TruncatedHarmonic	(	Float	center,
		Float	k,
		Float	threshold,
		Float	limit
	)

Parameters

[in]	center	The center point for the harmonic.
[in]	k	The spring constant for the harmonic.
[in]	threshold	How far the harmonic term extends from the center.
[in]	limit	The value to which the function converges above the threshold.

Note

I don't like having 4 floats on the initializer list, but don't really see an alternative. There are a few sanity checks, so the order is a bit hard to get wrong.

Definition at line 55 of file TruncatedHarmonic.h.

template<int DIRECTION>

IMP::core::TruncatedHarmonic< DIRECTION >::TruncatedHarmonic	(	Float	center,
		Float	k,
		Float	threshold
	)

Set limit to a reasonable value.

Definition at line 58 of file TruncatedHarmonic.h.

Member Function Documentation

template<int DIRECTION>

virtual double IMP::core::TruncatedHarmonic< DIRECTION >::evaluate ( double  feature ) const

virtual

Parameters

[in]

feature

Value of feature being tested.

Returns

Score

Reimplemented from IMP::kernel::UnaryFunction.

Definition at line 68 of file TruncatedHarmonic.h.

template<int DIRECTION>

virtual DerivativePair IMP::core::TruncatedHarmonic< DIRECTION >::evaluate_with_derivative ( double  feature ) const

virtual

Parameters

[in]

feature

Value of feature being tested.

Returns

a FloatPair containing the score and its partial derivative with respect to the given feaure.

Reimplemented from IMP::kernel::UnaryFunction.

Definition at line 60 of file TruncatedHarmonic.h.

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

• TruncatedHarmonic.h