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ConstraintModelAbstractTpl< _Scalar > Class Template Referenceabstract

Abstract class for constraint models. More...

#include <constraint-base.hpp>

Inheritance diagram for ConstraintModelAbstractTpl< _Scalar >:
ConstraintModelBase ConstraintModelNumDiffTpl< _Scalar > ConstraintModelResidualTpl< _Scalar >

Public Types

typedef ConstraintDataAbstractTpl< Scalar > ConstraintDataAbstract
 
typedef DataCollectorAbstractTpl< Scalar > DataCollectorAbstract
 
typedef MathBaseTpl< Scalar > MathBase
 
typedef ResidualModelAbstractTpl< Scalar > ResidualModelAbstract
 
typedef StateAbstractTpl< Scalar > StateAbstract
 
typedef MathBase::VectorXs VectorXs
 

Public Member Functions

 ConstraintModelAbstractTpl (std::shared_ptr< StateAbstract > state, const std::size_t ng, const std::size_t nh, const bool T_const=true)
 
 ConstraintModelAbstractTpl (std::shared_ptr< StateAbstract > state, const std::size_t nu, const std::size_t ng, const std::size_t nh, const bool T_const=true)
 the constraint model
 
 ConstraintModelAbstractTpl (std::shared_ptr< StateAbstract > state, std::shared_ptr< ResidualModelAbstract > residual, const std::size_t ng, const std::size_t nh)
 Initialize the constraint model.
 
virtual void calc (const std::shared_ptr< ConstraintDataAbstract > &data, const Eigen::Ref< const VectorXs > &x)
 Compute the constraint value for nodes that depends only on the state.
 
virtual void calc (const std::shared_ptr< ConstraintDataAbstract > &data, const Eigen::Ref< const VectorXs > &x, const Eigen::Ref< const VectorXs > &u)=0
 Compute the constraint value.
 
virtual void calcDiff (const std::shared_ptr< ConstraintDataAbstract > &data, const Eigen::Ref< const VectorXs > &x)
 Compute the Jacobian of the constraint with respect to the state only.
 
virtual void calcDiff (const std::shared_ptr< ConstraintDataAbstract > &data, const Eigen::Ref< const VectorXs > &x, const Eigen::Ref< const VectorXs > &u)=0
 Compute the Jacobian of the constraint.
 
virtual std::shared_ptr< ConstraintDataAbstractcreateData (DataCollectorAbstract *const data)
 Create the constraint data.
 
const VectorXs & get_lb () const
 Return the lower bound of the constraint.
 
std::size_t get_ng () const
 Return the number of inequality constraints.
 
std::size_t get_nh () const
 Return the number of equality constraints.
 
std::size_t get_nu () const
 Return the dimension of the control input.
 
const std::shared_ptr< ResidualModelAbstract > & get_residual () const
 Return the residual model.
 
const std::shared_ptr< StateAbstract > & get_state () const
 Return the state.
 
bool get_T_constraint () const
 Return true if the constraint is imposed in terminal nodes as well.
 
ConstraintType get_type () const
 Return the type of constraint.
 
const VectorXs & get_ub () const
 Return the upper bound of the constraint.
 
virtual void print (std::ostream &os) const
 Print relevant information of the constraint model.
 
void remove_bounds ()
 Remove the bounds of the constraint.
 
void update_bounds (const VectorXs &lower, const VectorXs &upper)
 Update the lower and upper bounds the upper bound of constraint.
 

Public Attributes

EIGEN_MAKE_ALIGNED_OPERATOR_NEW typedef _Scalar Scalar
 

Protected Attributes

VectorXs lb_
 Lower bound of the constraint.
 
std::size_t ng_
 Number of inequality constraints.
 
std::size_t nh_
 Number of equality constraints.
 
std::size_t nu_
 Control dimension.
 
std::shared_ptr< ResidualModelAbstractresidual_
 Residual model.
 
std::shared_ptr< StateAbstractstate_
 State description.
 
bool T_constraint_
 
ConstraintType type_
 Type of constraint: inequality=0, equality=1, both=2.
 
VectorXs ub_
 Upper bound of the constraint.
 
VectorXs unone_
 No control vector.
 

Friends

template<class Scalar >
std::ostream & operator<< (std::ostream &os, const CostModelAbstractTpl< Scalar > &model)
 Print information on the constraint model.
 

Detailed Description

template<typename _Scalar>
class crocoddyl::ConstraintModelAbstractTpl< _Scalar >

Abstract class for constraint models.

A constraint model defines both: inequality \(\mathbf{g}(\mathbf{x}, \mathbf{u})\in\mathbb{R}^{ng}\) and equality \(\mathbf{h}(\mathbf{x}, \mathbf{u})\in\mathbb{R}^{nh}\) constraints. The constraint function depends on the state point \(\mathbf{x}\in\mathcal{X}\), which lies in the state manifold described with a nx-tuple, its velocity \(\dot{\mathbf{x}}\in T_{\mathbf{x}}\mathcal{X}\) that belongs to the tangent space with ndx dimension, and the control input \(\mathbf{u}\in\mathbb{R}^{nu}\).

The main computations are carried out in calc() and calcDiff() routines. calc() computes the constraint residual and calcDiff() computes the Jacobians of the constraint function. Concretely speaking, calcDiff() builds a linear approximation of the constraint function with the form: \(\mathbf{g_x}\in\mathbb{R}^{ng\times ndx}\), \(\mathbf{g_u}\in\mathbb{R}^{ng\times nu}\), \(\mathbf{h_x}\in\mathbb{R}^{nh\times ndx}\) \(\mathbf{h_u}\in\mathbb{R}^{nh\times nu}\). Additionally, it is important to note that calcDiff() computes the derivatives using the latest stored values by calc(). Thus, we need to first run calc().

See also
calc(), calcDiff(), createData()

Definition at line 54 of file constraint-base.hpp.

Member Typedef Documentation

◆ MathBase

template<typename _Scalar >
typedef MathBaseTpl<Scalar> MathBase

Definition at line 59 of file constraint-base.hpp.

◆ ConstraintDataAbstract

template<typename _Scalar >
typedef ConstraintDataAbstractTpl<Scalar> ConstraintDataAbstract

Definition at line 60 of file constraint-base.hpp.

◆ StateAbstract

template<typename _Scalar >
typedef StateAbstractTpl<Scalar> StateAbstract

Definition at line 61 of file constraint-base.hpp.

◆ ResidualModelAbstract

template<typename _Scalar >
typedef ResidualModelAbstractTpl<Scalar> ResidualModelAbstract

Definition at line 62 of file constraint-base.hpp.

◆ DataCollectorAbstract

template<typename _Scalar >
typedef DataCollectorAbstractTpl<Scalar> DataCollectorAbstract

Definition at line 63 of file constraint-base.hpp.

◆ VectorXs

template<typename _Scalar >
typedef MathBase::VectorXs VectorXs

Definition at line 64 of file constraint-base.hpp.

Constructor & Destructor Documentation

◆ ConstraintModelAbstractTpl() [1/4]

template<typename _Scalar >
ConstraintModelAbstractTpl ( std::shared_ptr< StateAbstract state,
std::shared_ptr< ResidualModelAbstract residual,
const std::size_t  ng,
const std::size_t  nh 
)

Initialize the constraint model.

Parameters
[in]stateState of the multibody system
[in]residualResidual model
[in]ngNumber of inequality constraints
[in]nhNumber of equality constraints

◆ ConstraintModelAbstractTpl() [2/4]

template<typename _Scalar >
ConstraintModelAbstractTpl ( std::shared_ptr< StateAbstract state,
const std::size_t  nu,
const std::size_t  ng,
const std::size_t  nh,
const bool  T_const = true 
)

the constraint model

Parameters
[in]stateState of the multibody system
[in]nuDimension of control vector
[in]ngNumber of inequality constraints
[in]nhNumber of equality constraints
[in]T_constTrue if this is a constraint in both running and terminal nodes. False if it is a constraint on running nodes only (default true)

◆ ConstraintModelAbstractTpl() [3/4]

template<typename _Scalar >
ConstraintModelAbstractTpl ( std::shared_ptr< StateAbstract state,
const std::size_t  ng,
const std::size_t  nh,
const bool  T_const = true 
)

The default nu value is obtained from StateAbstractTpl::get_nv().

Parameters
[in]stateState of the multibody system
[in]ngNumber of inequality constraints
[in]nhNumber of equality constraints
[in]T_constTrue if this is a constraint in both running and terminal nodes. False if it is a constraint on running nodes only (default true)

◆ ConstraintModelAbstractTpl() [4/4]

template<typename _Scalar >
ConstraintModelAbstractTpl ( )
inlineprotected

Definition at line 264 of file constraint-base.hpp.

Member Function Documentation

◆ calc() [1/2]

template<typename _Scalar >
virtual void calc ( const std::shared_ptr< ConstraintDataAbstract > &  data,
const Eigen::Ref< const VectorXs > &  x,
const Eigen::Ref< const VectorXs > &  u 
)
pure virtual

Compute the constraint value.

Parameters
[in]dataConstraint data
[in]xState point \(\mathbf{x}\in\mathbb{R}^{ndx}\)
[in]uControl input \(\mathbf{u}\in\mathbb{R}^{nu}\)

Implemented in ConstraintModelResidualTpl< _Scalar >.

◆ calc() [2/2]

template<typename _Scalar >
virtual void calc ( const std::shared_ptr< ConstraintDataAbstract > &  data,
const Eigen::Ref< const VectorXs > &  x 
)
virtual

Compute the constraint value for nodes that depends only on the state.

It updates the constraint based on the state only. This function is commonly used in the terminal nodes of an optimal control problem.

Parameters
[in]dataConstraint data
[in]xState point \(\mathbf{x}\in\mathbb{R}^{ndx}\)

Reimplemented in ConstraintModelResidualTpl< _Scalar >.

◆ calcDiff() [1/2]

template<typename _Scalar >
virtual void calcDiff ( const std::shared_ptr< ConstraintDataAbstract > &  data,
const Eigen::Ref< const VectorXs > &  x,
const Eigen::Ref< const VectorXs > &  u 
)
pure virtual

Compute the Jacobian of the constraint.

It computes the Jacobian of the constraint function. It assumes that calc() has been run first.

Parameters
[in]dataConstraint data
[in]xState point \(\mathbf{x}\in\mathbb{R}^{ndx}\)
[in]uControl input \(\mathbf{u}\in\mathbb{R}^{nu}\)

Implemented in ConstraintModelResidualTpl< _Scalar >.

◆ calcDiff() [2/2]

template<typename _Scalar >
virtual void calcDiff ( const std::shared_ptr< ConstraintDataAbstract > &  data,
const Eigen::Ref< const VectorXs > &  x 
)
virtual

Compute the Jacobian of the constraint with respect to the state only.

It computes the Jacobian of the constraint function based on the state only. This function is commonly used in the terminal nodes of an optimal control problem.

Parameters
[in]dataConstraint data
[in]xState point \(\mathbf{x}\in\mathbb{R}^{ndx}\)

Reimplemented in ConstraintModelResidualTpl< _Scalar >.

◆ createData()

template<typename _Scalar >
virtual std::shared_ptr< ConstraintDataAbstract > createData ( DataCollectorAbstract *const  data)
virtual

Create the constraint data.

The default data contains objects to store the values of the constraint, residual vector and their first derivatives. However, it is possible to specialize this function is we need to create additional data, for instance, to avoid dynamic memory allocation.

Parameters
dataData collector
Returns
the constraint data

Reimplemented in ConstraintModelResidualTpl< _Scalar >, and ConstraintModelNumDiffTpl< _Scalar >.

◆ print()

template<typename _Scalar >
virtual void print ( std::ostream &  os) const
virtual

Print relevant information of the constraint model.

Parameters
[out]osOutput stream object

Reimplemented in ConstraintModelResidualTpl< _Scalar >.

Member Data Documentation

◆ Scalar

template<typename _Scalar >
EIGEN_MAKE_ALIGNED_OPERATOR_NEW typedef _Scalar Scalar

Definition at line 58 of file constraint-base.hpp.

◆ state_

template<typename _Scalar >
std::shared_ptr<StateAbstract> state_
protected

State description.

Definition at line 252 of file constraint-base.hpp.

◆ residual_

template<typename _Scalar >
std::shared_ptr<ResidualModelAbstract> residual_
protected

Residual model.

Definition at line 253 of file constraint-base.hpp.

◆ type_

template<typename _Scalar >
ConstraintType type_
protected

Type of constraint: inequality=0, equality=1, both=2.

Definition at line 255 of file constraint-base.hpp.

◆ lb_

template<typename _Scalar >
VectorXs lb_
protected

Lower bound of the constraint.

Definition at line 256 of file constraint-base.hpp.

◆ ub_

template<typename _Scalar >
VectorXs ub_
protected

Upper bound of the constraint.

Definition at line 257 of file constraint-base.hpp.

◆ nu_

template<typename _Scalar >
std::size_t nu_
protected

Control dimension.

Definition at line 258 of file constraint-base.hpp.

◆ ng_

template<typename _Scalar >
std::size_t ng_
protected

Number of inequality constraints.

Definition at line 259 of file constraint-base.hpp.

◆ nh_

template<typename _Scalar >
std::size_t nh_
protected

Number of equality constraints.

Definition at line 260 of file constraint-base.hpp.

◆ T_constraint_

template<typename _Scalar >
bool T_constraint_
protected

Label that indicates if the constraint is imposed in terminal nodes as well

Definition at line 261 of file constraint-base.hpp.

◆ unone_

template<typename _Scalar >
VectorXs unone_
protected

No control vector.

Definition at line 263 of file constraint-base.hpp.


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