org.apache.commons.math3.analysis.differentiation

## Class GradientFunction

- java.lang.Object
- - org.apache.commons.math3.analysis.differentiation.GradientFunction

All Implemented Interfaces:
  MultivariateVectorFunction

    public class GradientFunction
    extends Object
    implements MultivariateVectorFunction

Class representing the gradient of a multivariate function.

The vectorial components of the function represent the derivatives with respect to each function parameters.

Since:
  3.1
Version:
  $Id: GradientFunction.java 1416643 2012-12-03 19:37:14Z tn $

### Field Summary

Fields
`private MultivariateDifferentiableFunction` `f` Underlying real-valued function.

### Constructor Summary

Constructors
Constructor and Description
`GradientFunction(MultivariateDifferentiableFunction f)` Simple constructor.

### Method Summary

Methods
`double[]` `value(double[] point)` Compute the value for the function at the given point.

### Methods inherited from class java.lang.Object

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

### Field Detail

#### f

    private final MultivariateDifferentiableFunction f

Underlying real-valued function.

### Constructor Detail

#### GradientFunction

    public GradientFunction(MultivariateDifferentiableFunction f)

Simple constructor.

Parameters:
  `f` - underlying real-valued function

### Method Detail

#### value

    public double[] value(double[] point)
                   throws IllegalArgumentException

Compute the value for the function at the given point.

Specified by:
  `value` in interface `MultivariateVectorFunction`
Parameters:
  `point` - point at which the function must be evaluated
Returns:
  function value for the given point
Throws:
  `IllegalArgumentException` - if points dimension is wrong