com.numericalmethod.suanshu.analysis.differentiation.multivariate

Class GradientFunction

java.lang.Object

com.numericalmethod.suanshu.analysis.differentiation.multivariate.GradientFunction

All Implemented Interfaces:

Function<Vector,Vector>, RealVectorFunction, java.io.Serializable

public class GradientFunction
extends java.lang.Object
implements RealVectorFunction

The gradient function, g(x), evaluates the gradient of a real scalar function f at a point x. g(x) has the same domain as f(x). Its range dimension is the same as the domain dimension.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface com.numericalmethod.suanshu.analysis.function.Function

Function.EvaluationException

Constructor Summary

Constructors

Constructor and Description
GradientFunction(RealScalarFunction f) Construct the gradient function of a real scalar function f.

Method Summary

Modifier and Type	Method and Description
int	dimensionOfDomain() Get the number of variables the function has.
int	dimensionOfRange() Get the dimension of the range space of the function.
Vector	evaluate(Vector x) Evaluate the function f at x, where x is from the domain.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GradientFunction

public GradientFunction(RealScalarFunction f)

Construct the gradient function of a real scalar function f.

Parameters:

f - a real scalar function

Method Detail

evaluate

public Vector evaluate(Vector x)

Description copied from interface: Function

Evaluate the function f at x, where x is from the domain.

Specified by:

evaluate in interface Function<Vector,Vector>

Parameters:

x - x

Returns:

f(x)

dimensionOfDomain

public int dimensionOfDomain()

Description copied from interface: Function

Get the number of variables the function has. For example, for a univariate function, the domain dimension is 1; for a bivariate function, the domain dimension is 2.

Specified by:

dimensionOfDomain in interface Function<Vector,Vector>

Returns:

the number of variables

dimensionOfRange

public int dimensionOfRange()

Description copied from interface: Function

Get the dimension of the range space of the function. For example, for a Rⁿ->R^m function, the dimension of the range is m.

Specified by:

dimensionOfRange in interface Function<Vector,Vector>

Returns:

the dimension of the range