Class container for the Bracketing algorithms. More...

#include <Bracketing.hh>

Inherits Optimist::RootFinder::RootFinder< Scalar, DerivedSolver >.

Public Member Functions
	Bracketing ()
constexpr std::string	name_impl () const
void	tolerance_bracketing (Scalar t_tolerance)
template<typename FunctionLambda>
bool	solve_impl (FunctionLambda &&function, Scalar, Scalar &x_sol)
template<typename FunctionLambda>
Scalar	find_root (FunctionLambda &&function)
Public Member Functions inherited from Optimist::RootFinder::RootFinder< Scalar, DerivedSolver >
	RootFinder ()
constexpr std::string	name () const
Integer	jacobian_evaluations () const
Integer	max_jacobian_evaluations () const
Integer	hessian_evaluations () const
Integer	max_hessian_evaluations () const
bool	solve (FunctionLambda &&function, const Input &x_ini, Output &x_sol)
Public Member Functions inherited from Optimist::SolverBase< Scalar, Scalar, DerivedSolver >
	SolverBase ()
void	reset_bounds (const Integer n=InputTrait::IsDynamic ? 0 :InputTrait::Dimension)
const Scalar &	lower_bound () const
const Scalar &	upper_bound () const
void	bounds (const Scalar &t_lower_bound, const Scalar &t_upper_bound)
constexpr Integer	input_dimension () const
constexpr Integer	output_dimension () const
Integer	function_evaluations () const
void	max_function_evaluations (const Integer t_max_function_evaluations)
Integer	iterations () const
Integer	max_iterations () const
Scalar	alpha () const
Integer	relaxations () const
Integer	max_relaxations () const
Scalar	tolerance () const
void	verbose_mode (bool t_verbose)
void	enable_verbose_mode ()
void	disable_verbose_mode ()
void	damped_mode (bool t_damped)
void	enable_damped_mode ()
void	disable_damped_mode ()
std::string	task () const
bool	converged () const
std::ostream &	ostream () const
bool	solve (FunctionLambda &&function, const Scalar &x_ini, Scalar &x_sol)
bool	rootfind (const FunctionBase< FunctionInput, FunctionOutput, DerivedFunction > &function, const Scalar &x_ini, Scalar &x_sol)
bool	optimize (const FunctionBase< FunctionInput, FunctionOutput, DerivedFunction > &function, const Scalar &x_ini, Scalar &x_sol)
constexpr std::string	name () const

Protected Attributes
Scalar	m_tolerance_bracketing
Scalar	m_mu {0.5}
Scalar	m_interval_shink {0.025}
Scalar	m_a {0.0}
Scalar	m_fa {0.0}
Scalar	m_b {0.0}
Scalar	m_fb {0.0}
Scalar	m_c {0.0}
Scalar	m_fc {0.0}
Scalar	m_d {0.0}
Scalar	m_fd {0.0}
Scalar	m_e {0.0}
Scalar	m_fe {0.0}
Protected Attributes inherited from Optimist::SolverBase< Scalar, Scalar, DerivedSolver >
Scalar	m_lower_bound
Scalar	m_upper_bound
Integer	m_function_evaluations
Integer	m_first_derivative_evaluations
Integer	m_second_derivative_evaluations
Integer	m_max_function_evaluations
Integer	m_max_first_derivative_evaluations
Integer	m_max_second_derivative_evaluations
Integer	m_iterations
Integer	m_max_iterations
Scalar	m_alpha
Integer	m_relaxations
Integer	m_max_relaxations
Scalar	m_tolerance
bool	m_verbose
bool	m_damped
std::ostream *	m_ostream
std::string	m_task
bool	m_converged

Additional Inherited Members
Public Types inherited from Optimist::RootFinder::RootFinder< Scalar, DerivedSolver >
using	Scalar
using	Input
using	Output
Public Types inherited from Optimist::SolverBase< Scalar, Scalar, DerivedSolver >
using	InputTrait
using	OutputTrait
using	Scalar
using	FirstDerivative
using	SecondDerivative
Static Public Attributes inherited from Optimist::RootFinder::RootFinder< Scalar, DerivedSolver >
static constexpr bool	IsRootFinder
static constexpr bool	IsOptimizer
Protected Member Functions inherited from Optimist::RootFinder::RootFinder< Scalar, DerivedSolver >
bool	evaluate_jacobian (JacobianLambda &&jacobian, const Input &x, FirstDerivative &out)
bool	evaluate_hessian (HessianLambda &&hessian, const Input &x, SecondDerivative &out)
Protected Member Functions inherited from Optimist::SolverBase< Scalar, Scalar, DerivedSolver >
Integer	first_derivative_evaluations () const
Integer	max_first_derivative_evaluations () const
Integer	second_derivative_evaluations () const
Integer	max_second_derivative_evaluations () const
void	reset_counters ()
bool	evaluate_function (FunctionLambda &&function, const Scalar &x, Scalar &out)
bool	evaluate_first_derivative (FirstDerivativeLambda &&function, const Scalar &x, FirstDerivative &out)
bool	evaluate_second_derivative (SecondDerivativeLambda &&function, const Scalar &x, SecondDerivative &out)
bool	damp (FunctionLambda &&function, const Scalar &x_old, const Scalar &function_old, const Scalar &step_old, Scalar &x_new, Scalar &function_new, Scalar &step_new)
void	header ()
void	bottom ()
void	info (Scalar residuals, const std::string &notes="-")

Detailed Description

template<typename Scalar, typename DerivedSolver>
class Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >

The Bracketing algorithms allow to find the roots of a scalar function \(f(x)\) in a given interval \([a, b]\).

Template Parameters

Scalar Floating-point number type.

Constructor & Destructor Documentation

◆ Bracketing()

template<typename Scalar, typename DerivedSolver>

Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::Bracketing ( )

inline

Class constructor for the Bracketing.

Member Function Documentation

◆ find_root()

template<typename Scalar, typename DerivedSolver>

template<typename FunctionLambda>

Scalar Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::find_root ( FunctionLambda && function )

inline

Finds either an exact solution or an approximate solution of the equation \(f(x) = 0\) in the interval \([a, b]\).

Template Parameters

FunctionLambda The lambda function type.

Parameters

[in] function Function lambda.

Returns: The approximate root.

◆ name_impl()

template<typename Scalar, typename DerivedSolver>

std::string Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::name_impl ( ) const

inlineconstexpr

Get the Bracketing solver name.

Returns: The Bracketing solver name.

◆ solve_impl()

template<typename Scalar, typename DerivedSolver>

template<typename FunctionLambda>

bool Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::solve_impl	(	FunctionLambda &&	function,
		Scalar	,
		Scalar &	x_sol )

inline

Solve the nonlinear equation \( f(x) = 0 \), with \( f: \mathbb{R} \rightarrow \mathbb{R} \).

Template Parameters

FunctionLambda The lambda function type.

Parameters

[in]	function	Function lambda.
[in]	x_ini	Initialization point (not used).
[out]	x_sol	Solution point.

Returns: The convergence boolean flag.

◆ tolerance_bracketing()

template<typename Scalar, typename DerivedSolver>

void Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::tolerance_bracketing ( Scalar t_tolerance )

inline

Set the tolerance for the Bracketing solver.

Parameters

[in] t_tolerance The input value at which the tolerance is computed.

Note: To accurately find polynomial roots, the tolerance should be set to \( 100\epsilon(0) \).

Member Data Documentation

◆ m_a

template<typename Scalar, typename DerivedSolver>

Scalar Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::m_a {0.0}

protected

◆ m_b

template<typename Scalar, typename DerivedSolver>

Scalar Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::m_b {0.0}

protected

◆ m_c

template<typename Scalar, typename DerivedSolver>

Scalar Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::m_c {0.0}

protected

◆ m_d

template<typename Scalar, typename DerivedSolver>

Scalar Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::m_d {0.0}

protected

◆ m_e

template<typename Scalar, typename DerivedSolver>

Scalar Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::m_e {0.0}

protected

◆ m_fa

template<typename Scalar, typename DerivedSolver>

Scalar Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::m_fa {0.0}

protected

◆ m_fb

template<typename Scalar, typename DerivedSolver>

Scalar Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::m_fb {0.0}

protected

◆ m_fc

template<typename Scalar, typename DerivedSolver>

Scalar Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::m_fc {0.0}

protected

◆ m_fd

template<typename Scalar, typename DerivedSolver>

Scalar Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::m_fd {0.0}

protected

◆ m_fe

template<typename Scalar, typename DerivedSolver>

Scalar Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::m_fe {0.0}

protected

◆ m_interval_shink

template<typename Scalar, typename DerivedSolver>

Scalar Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::m_interval_shink {0.025}

protected

Interval shrinking factor.

◆ m_mu

template<typename Scalar, typename DerivedSolver>

Scalar Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::m_mu {0.5}

protected

Parameter \( \mu \).

◆ m_tolerance_bracketing

template<typename Scalar, typename DerivedSolver>

Scalar Optimist::RootFinder::Bracketing< Scalar, DerivedSolver >::m_tolerance_bracketing

protected

Initial value:

{

100 * EPSILON}

Tolerance for the Bracketing solver.

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

core/include/Optimist/RootFinder/Bracketing.hh

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ Bracketing()

Member Function Documentation

◆ find_root()

◆ name_impl()

◆ solve_impl()

◆ tolerance_bracketing()

Member Data Documentation

◆ m_a

◆ m_b

◆ m_c

◆ m_d

◆ m_e

◆ m_fa

◆ m_fb

◆ m_fc

◆ m_fd

◆ m_fe

◆ m_interval_shink

◆ m_mu

◆ m_tolerance_bracketing