Constant Class Reference

This is a Function_ subclass which simply returns a fixed value, independent of its arguments. More...

#include <Function.h>

Inheritance diagram for Constant:

Public Member Functions
	Constant (T value, int argumentSize=1)
	Create a Function_::Constant 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.

Detailed Description

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

This is a Function_ subclass which simply returns a fixed value, independent of its arguments.

Constructor & Destructor Documentation

Constant	(	T	value,
		int	argumentSize = `1`
	)			`[inline, explicit]`

Create a Function_::Constant object.

Parameters:

	value	the value which should be returned by calcValue();
	argumentSize	the value which should be returned by getArgumentSize(), with a default of 1.

Member Function Documentation

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

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

Reimplemented from Function_< T >.

References Constant::calcDerivative().

Referenced by Constant::calcDerivative().

T 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().