Identity (Apache Commons Math 3.6.1 API)

java.lang.Object

org.apache.commons.math3.analysis.function.Identity

All Implemented Interfaces:: DifferentiableUnivariateFunction, UnivariateDifferentiableFunction, UnivariateFunction

public class Identity extends Object implements UnivariateDifferentiableFunction, DifferentiableUnivariateFunction

Identity function.

Since:: 3.0

Constructor Summary

Constructors

Constructor

Description

Identity()
Method Summary

Modifier and Type

Method

Description

DifferentiableUnivariateFunction

derivative()

Deprecated.
as of 3.1, replaced by value(DerivativeStructure)

double

value(double x)

Compute the value of the function.

DerivativeStructure

value(DerivativeStructure t)

Simple mathematical function.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details
- Identity
  
  public Identity()
Method Details
- value
  
  public double value(double x)
  
  Compute the value of the function.
  
  Specified by:
  
  value in interface UnivariateFunction
  
  Parameters:
  
  x - Point at which the function value should be computed.
  
  Returns:
  
  the value of the function.
- derivative
  
  @Deprecated public DifferentiableUnivariateFunction derivative()
  
  Deprecated.
  as of 3.1, replaced by value(DerivativeStructure)
  
  Returns the derivative of the function
  
  Specified by:
  
  derivative in interface DifferentiableUnivariateFunction
  
  Returns:
  
  the derivative function
- value
  
  public DerivativeStructure value(DerivativeStructure t)
  
  Simple mathematical function.
  UnivariateDifferentiableFunction classes compute both the value and the first derivative of the function.
  
  Specified by:
  
  value in interface UnivariateDifferentiableFunction
  
  Parameters:
  
  t - function input value
  
  Returns:
  
  function result
  
  Since:
  
  3.1