LinearizedCoulombFunction class. More...

#include <LinearizedCoulombFunction.h>

Inheritance diagram for ocra::LinearizedCoulombFunction:

Collaboration diagram for ocra::LinearizedCoulombFunction:

Public Types
typedef LinearFunction	functionType_t

Public Types inherited from ocra::LinearFunction
typedef Function	functionType_t

Public Member Functions
	LinearizedCoulombFunction (Variable &f, double frictionCoeff, int numberOfFaces=4, double margin=0)


double	getFrictionCoeff () const

double	getMargin () const

void	setFrictionCoeff (double coeff)

void	setMargin (double margin)

void	setConeOrientation (const Matrix3d &R)

const Matrix3d &	getConeOrientation () const

Public Member Functions inherited from ocra::LinearFunction
template<class Derived , class VectorBase >
	LinearFunction (Variable &x, const MatrixBase< Derived > &A, const VectorBase &b)

	~LinearFunction ()

void	invalidateb (int timestamp)

const MatrixXd &	getA () const

const VectorXd &	getb () const

void	changeA (const MatrixXd &A)

void	changeb (const VectorXd &b)

Public Member Functions inherited from ocra::Function
virtual	~Function ()

int	getDimension () const

virtual void	updateFdot () const

virtual void	updateFddot () const

virtual void	updateJdotXdot () const

const Variable &	getVariable () const

Variable &	getVariable ()

template<eFunctionAbility Ability>
void	invalidate ()

void	invalidateAll (int timestamp)

void	invalidateAll ()

template<eFunctionAbility Ability>
bool	isValid () const

template<eFunctionAbility Ability>
bool	canCompute () const

template<eFunctionAbility Ability>
const IFunction< Ability >::return_type &	get () const

template<eFunctionAbility Ability>
IFunction< Ability >::return_sub_type	get (int index) const

const VectorXd &	getValue () const

double	getValue (int index) const

const MatrixXd &	getJacobian () const

MatrixXdRow	getJacobian (int index) const

Public Member Functions inherited from ocra::ObserverSubject
	ObserverSubject ()

virtual	~ObserverSubject ()

Public Member Functions inherited from ocra::Observer
virtual	~Observer ()

template<int EVT>
void	bind (SubjectBase< EVT > &subject)
	Call this method to automatically propagate observed events to observers connected to the subject given in argument. More...

template<int EVT>
void	stopPropagation ()

Public Member Functions inherited from ocra::ObserverBase< EVT_RESIZE >
void	bind (subject_type &subject)
	Call this method to automatically propagate observed events to observers connected to the subject given in argument. More...

Public Member Functions inherited from ocra::ObserverBase< EVT_CHANGE_DEPENDENCIES >
void	bind (subject_type &subject)
	Call this method to automatically propagate observed events to observers connected to the subject given in argument. More...

Public Member Functions inherited from ocra::ObserverBase< EVT_CHANGE_VALUE >
void	bind (subject_type &subject)
	Call this method to automatically propagate observed events to observers connected to the subject given in argument. More...

Public Member Functions inherited from ocra::Subject
virtual	~Subject ()

template<int EVT, class Derived , class Base >
void	connect (Derived &object, void(Base::*newCallback)(int)) const
	Call this method to register a non-static method as a callback. More...

template<int EVT>
void	connect (void(*newCallback)(int)) const
	Call this method to register a free function as a callback. More...

template<int EVT, class Derived , class Base >
void	disconnect (Derived &object, void(Base::*callbackToErase)(int)) const
	Disconnect non-static method. More...

template<int EVT>
void	disconnect (void(*callbackToErase)(int)) const
	Disconnect free function. More...

template<int EVT>
void	propagate () const

template<int EVT>
void	propagate (int timestamp) const

Public Member Functions inherited from ocra::SubjectBase< EVT_RESIZE >
void	connect (T &object, typename SubjectBaseTraits< EVT, T >::callback_type newCallback) const
	Call this method to register a non-static method as a callback. More...

void	connect (typename SubjectBaseTraits< EVT, void >::callback_type newCallback) const
	Call this method to register a free function as a callback. More...

void	disconnect (T &object, typename SubjectBaseTraits< EVT, T >::callback_type callback) const
	Disconnect non-static method. More...

void	disconnect (typename SubjectBaseTraits< EVT, void >::callback_type callbackToErase) const
	Disconnect free function. More...

void	propagate (int timestamp) const

void	propagate () const

Public Member Functions inherited from ocra::SubjectBase< EVT_CHANGE_DEPENDENCIES >
void	connect (T &object, typename SubjectBaseTraits< EVT, T >::callback_type newCallback) const
	Call this method to register a non-static method as a callback. More...

void	connect (typename SubjectBaseTraits< EVT, void >::callback_type newCallback) const
	Call this method to register a free function as a callback. More...

void	disconnect (T &object, typename SubjectBaseTraits< EVT, T >::callback_type callback) const
	Disconnect non-static method. More...

void	disconnect (typename SubjectBaseTraits< EVT, void >::callback_type callbackToErase) const
	Disconnect free function. More...

void	propagate (int timestamp) const

void	propagate () const

Public Member Functions inherited from ocra::SubjectBase< EVT_CHANGE_VALUE >
void	connect (T &object, typename SubjectBaseTraits< EVT, T >::callback_type newCallback) const
	Call this method to register a non-static method as a callback. More...

void	connect (typename SubjectBaseTraits< EVT, void >::callback_type newCallback) const
	Call this method to register a free function as a callback. More...

void	disconnect (T &object, typename SubjectBaseTraits< EVT, T >::callback_type callback) const
	Disconnect non-static method. More...

void	disconnect (typename SubjectBaseTraits< EVT, void >::callback_type callbackToErase) const
	Disconnect free function. More...

void	propagate (int timestamp) const

void	propagate () const

Public Member Functions inherited from ocra::IFunctionProperties
bool	hasSeparableTimeDependancy (void) const

eFunctionLinearity	getType (void) const

eFunctionConvexity	getConvexityProperty (void) const

int	getContinuityProperty (void) const

const std::string &	getProperty (int i) const

int	getNumberOfProperties (void) const

bool	hasProperty (const std::string &functionProperty) const

bool	isExplicitlyTimeDependant (void) const

Public Member Functions inherited from ocra::NamedInstance
	NamedInstance (const std::string &name)

const std::string &	getName () const

virtual	~NamedInstance ()

Public Member Functions inherited from ocra::AbilitySet
AbilitySet &	add (eFunctionAbility prop)

AbilitySet &	remove (eFunctionAbility prop)

Protected Attributes
double	_mu

double	_margin

Matrix3d	_R_cone

MatrixXd	_J_cache

Protected Attributes inherited from ocra::LinearFunction
VectorXd	_b

bool	_bIsUpToDate

Protected Attributes inherited from ocra::Function
Variable &	x

VectorXd &	_value

MatrixXd &	_jacobian

const int &	_dim

Static Protected Attributes
static const double	ANGLE_OFFSET = 0

Additional Inherited Members
Protected Types inherited from ocra::ObserverBase< EVT_RESIZE >
typedef SubjectBase< EVT >	subject_type

typedef InvokerBase< EVT >	invoker_type

Protected Types inherited from ocra::ObserverBase< EVT_CHANGE_DEPENDENCIES >
typedef SubjectBase< EVT >	subject_type

typedef InvokerBase< EVT >	invoker_type

Protected Types inherited from ocra::ObserverBase< EVT_CHANGE_VALUE >
typedef SubjectBase< EVT >	subject_type

typedef InvokerBase< EVT >	invoker_type

Protected Member Functions inherited from ocra::LinearFunction
	LinearFunction (Variable &x, int dimension)

virtual void	updateb () const

virtual void	doUpdateInputSizeEnd ()

virtual void	updateValue () const

virtual void	updateJacobian () const

virtual void	doChangeA (const MatrixXd &A)

virtual void	doChangeb (const VectorXd &b)

void	inhibitPropagationFromb () const

void	desinhibitPropagationFromb () const

Protected Member Functions inherited from ocra::Function
	Function (Variable &x, int dimension, eFunctionLinearity linearity=LINEARITY_UNDEFINED, eFunctionConvexity convexity=CONVEXITY_UNDEFINED, int continuity=CONTINUITY_UNKNOWN, bool explicitlyTimeDependant=false, bool separableTimeDependancy=true)
	Function Constructor. More...

void	disconnectVariable ()

void	changeFunctionDimension (int newDimension)

void	updateInputSize (int timestamp)

void	resize ()

virtual int	computeDimensionFromInputSize () const

virtual void	doUpdateInputSizeBegin ()

virtual void	doUpdateDimensionBegin (int newDimension)

virtual void	doUpdateDimensionEnd (int oldDimension)

Protected Member Functions inherited from ocra::ObserverBase< EVT_RESIZE >
void	stopPropagation ()
	Call this method from your callbacks to avoid propagation to the bound subject (if any). More...

	ObserverBase ()

	~ObserverBase ()

Protected Member Functions inherited from ocra::ObserverBase< EVT_CHANGE_DEPENDENCIES >
void	stopPropagation ()
	Call this method from your callbacks to avoid propagation to the bound subject (if any). More...

	ObserverBase ()

	~ObserverBase ()

Protected Member Functions inherited from ocra::ObserverBase< EVT_CHANGE_VALUE >
void	stopPropagation ()
	Call this method from your callbacks to avoid propagation to the bound subject (if any). More...

	ObserverBase ()

	~ObserverBase ()

Protected Member Functions inherited from ocra::SubjectBase< EVT_RESIZE >
	SubjectBase ()

	~SubjectBase ()

Protected Member Functions inherited from ocra::SubjectBase< EVT_CHANGE_DEPENDENCIES >
	SubjectBase ()

	~SubjectBase ()

Protected Member Functions inherited from ocra::SubjectBase< EVT_CHANGE_VALUE >
	SubjectBase ()

	~SubjectBase ()

Protected Member Functions inherited from ocra::IFunctionProperties
	IFunctionProperties (eFunctionLinearity linearity=LINEARITY_UNDEFINED, eFunctionConvexity convexity=CONVEXITY_UNDEFINED, int continuity=CONTINUITY_UNKNOWN, bool explicitlyTimeDependant=false, bool separableTimeDependancy=true)
	IFunctionProperties Constructor. More...

void	changeType (eFunctionLinearity newType)

void	changeConvexityProperty (eFunctionConvexity newProperty)

void	changeContinuityProperty (int newProperty)

void	addProperty (const std::string &functionProperty)

void	removeProperty (const std::string &functionProperty)

void	changeExplicitTimeDependancy (bool b)

void	changeSeparableTimeDependancy (bool b)

Protected Member Functions inherited from ocra::AbilitySet
	AbilitySet (const std::vector< bool > &usageSet)

const std::vector< bool > &	getUsageSet () const

	AbilitySet (eFunctionAbility prop0=FUN_VALUE, eFunctionAbility prop1=FUN_VALUE)

	AbilitySet (eFunctionAbility prop0, eFunctionAbility prop1, eFunctionAbility prop2, eFunctionAbility prop3=FUN_VALUE, eFunctionAbility prop4=FUN_VALUE)

	AbilitySet (eFunctionAbility prop0, eFunctionAbility prop1, eFunctionAbility prop2, eFunctionAbility prop3, eFunctionAbility prop4, eFunctionAbility prop5, eFunctionAbility prop6=FUN_VALUE, eFunctionAbility prop7=FUN_VALUE, eFunctionAbility prop8=FUN_VALUE, eFunctionAbility prop9=FUN_VALUE)

Protected Member Functions inherited from ocra::CoupledInputOutputSize
	CoupledInputOutputSize (bool coupledInputOutputSize)

bool	inputAndOutputSizesAreCoupled () const

Detailed Description

LinearizedCoulombFunction class.

Warning: None

Implementation of $\left\|f_t\right\| - \mu f_n$ discretized and linearized. The function is thus a linear function Af+b with b normally equal to 0 and A built so that f is in the cone if $Af+b \le 0$ . b can however be given a constant non-zero value to account for a (possibly negative) margin.

Definition at line 34 of file LinearizedCoulombFunction.h.

Member Typedef Documentation

typedef LinearFunction ocra::LinearizedCoulombFunction::functionType_t

Definition at line 38 of file LinearizedCoulombFunction.h.

Constructor & Destructor Documentation

ocra::LinearizedCoulombFunction::LinearizedCoulombFunction	(	Variable &	f,
		double	frictionCoeff,
		int	numberOfFaces = `4`,
		double	margin = `0`
	)

Constructor Build a linear function Af+b such as Af+b<=0 is a discretized cone with numberOfFaces conservatively representing a Coulomb friction cone with friction coefficient frictionCoeff. f is supposed to represent a 3-dimensionnal force in a local frame whose z-axis is the normal vector at the contact point (so that it is the axis of the cone). b should therefore be equal to zero (which is its default value, but could have its components set to another value to account for a (possibly negative) margin.

By default, the first edge of the cone will be in the xz plane. This can however be changed by setting the static parameter ANGLE_OFFSET to a non-zero value.