SimTK::Function_< T >::Linear Class Reference

This is a Function_ subclass whose output value is a linear function of its arguments: f(x, y, ...) = ax+by+...+c. More...

#include <Function.h>

Inheritance diagram for SimTK::Function_< T >::Linear:

List of all members.

Public Member Functions
	Linear (const Vector_< T > &coefficients)
	Create a Function_::Linear object.
T	calcValue (const Vector &x) const
	Calculate the value of this function at a particular point.
T	calcDerivative (const Array_< int > &derivComponents, const Vector &x) const
	Calculate a partial derivative of this function at a particular point.
virtual int	getArgumentSize () const
	Get the number of components expected in the input vector.
int	getMaxDerivativeOrder () const
	Get the maximum derivative order this Function_ object can calculate.
T	calcDerivative (const std::vector< int > &derivComponents, const Vector &x) const
	This provides compatibility with std::vector without requiring any copying.

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Detailed Description

template<class T>
class SimTK::Function_< T >::Linear

This is a Function_ subclass whose output value is a linear function of its arguments: f(x, y, ...) = ax+by+...+c.

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Constructor & Destructor Documentation

template<class T >

SimTK::Function_< T >::Linear::Linear

(

const Vector_< T > &

coefficients

)

[inline, explicit]

Create a Function_::Linear object.

Parameters:

coefficients

The coefficients of the linear function. The number of arguments expected by the function is equal to coefficients.size()-1. coefficients[0] is the coefficient for the first argument, coefficients[1] is the coefficient for the second argument, etc. The final element of coefficients contains the constant term.

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Member Function Documentation

template<class T >

T SimTK::Function_< T >::Linear::calcValue

(

const Vector &

x

)

const [inline, virtual]

Calculate the value of this function at a particular point.

Parameters:

x	the Vector of input arguments. Its size must equal the value returned by getArgumentSize().

Implements SimTK::Function_< T >.

template<class T >

T SimTK::Function_< T >::Linear::calcDerivative	(	const Array_< int > &	derivComponents,
		const Vector &	x
	)		const [inline, virtual]

Calculate a partial derivative of this function at a particular point.

Which derivative to take is specified by listing the input components with which to take it. For example, if derivComponents=={0}, that indicates a first derivative with respective to component 0. If derivComponents=={0, 0, 0}, that indicates a third derivative with respective to component 0. If derivComponents=={4, 7}, that indicates a partial second derivative with respect to components 4 and 7.

Parameters:

derivComponents	The input components with respect to which the derivative should be taken. Its size must be less than or equal to the value returned by getMaxDerivativeOrder().
x	The Vector of input arguments. Its size must equal the value returned by getArgumentSize().

Returns:

The value of the selected derivative, which is of type T.

Implements SimTK::Function_< T >.

template<class T >

virtual int SimTK::Function_< T >::Linear::getArgumentSize

(

)

const [inline, virtual]

Get the number of components expected in the input vector.

Implements SimTK::Function_< T >.

template<class T >

int SimTK::Function_< T >::Linear::getMaxDerivativeOrder

(

)

const [inline, virtual]

Get the maximum derivative order this Function_ object can calculate.

Implements SimTK::Function_< T >.

template<class T >

T SimTK::Function_< T >::Linear::calcDerivative	(	const std::vector< int > &	derivComponents,
		const Vector &	x
	)		const [inline]

This provides compatibility with std::vector without requiring any copying.

Reimplemented from SimTK::Function_< T >.

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

• Function.h