java.lang.Object
- org.apache.commons.math.analysis.ComposableFunction

All Implemented Interfaces:

UnivariateRealFunction
```
public abstract class ComposableFunction
extends java.lang.Object
implements UnivariateRealFunction
```
Base class for UnivariateRealFunction that can be composed with other functions.

Since:

2.1

Field Summary

Fields
Modifier and Type	Field	Description
`static ComposableFunction`	`ABS`	The `FastMath.abs` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`ACOS`	The `FastMath.abs` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`ASIN`	The `FastMath.asin` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`ATAN`	The `FastMath.atan` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`CBRT`	The `FastMath.cbrt` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`CEIL`	The `FastMath.ceil` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`COS`	The `FastMath.cos` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`COSH`	The `FastMath.cosh` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`EXP`	The `FastMath.exp` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`EXPM1`	The `FastMath.expm1` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`FLOOR`	The `FastMath.floor` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`IDENTITY`	The identity function.
`static ComposableFunction`	`INVERT`	The invert operator wrapped as a `ComposableFunction`.
`static ComposableFunction`	`LOG`	The `FastMath.log` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`LOG10`	The `FastMath.log10` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`LOG1P`	The `FastMath.log1p` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`NEGATE`	The - operator wrapped as a `ComposableFunction`.
`static ComposableFunction`	`ONE`	The constant function always returning 1.
`static ComposableFunction`	`RINT`	The `FastMath.rint` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`SIGNUM`	The `FastMath.signum` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`SIN`	The `FastMath.sin` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`SINH`	The `FastMath.sinh` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`SQRT`	The `FastMath.sqrt` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`TAN`	The `FastMath.tan` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`TANH`	The `FastMath.tanh` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`ULP`	The `FastMath.ulp` method wrapped as a `ComposableFunction`.
`static ComposableFunction`	`ZERO`	The constant function always returning 0.

Constructor Summary

Constructors
Constructor Description

ComposableFunction()

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`ComposableFunction`	`add(double a)`	Return a function adding a constant term to the instance.
`ComposableFunction`	`add(UnivariateRealFunction f)`	Return a function adding the instance and another function.
`MultivariateRealFunction`	`asCollector()`	Generates a function that iteratively apply instance function on all elements of an array.
`MultivariateRealFunction`	`asCollector(double initialValue)`	Generates a function that iteratively apply instance function on all elements of an array.
`MultivariateRealFunction`	`asCollector(BivariateRealFunction combiner)`	Generates a function that iteratively apply instance function on all elements of an array.
`MultivariateRealFunction`	`asCollector(BivariateRealFunction combiner, double initialValue)`	Generates a function that iteratively apply instance function on all elements of an array.
`ComposableFunction`	`combine(UnivariateRealFunction f, BivariateRealFunction combiner)`	Return a function combining the instance and another function.
`ComposableFunction`	`divide(UnivariateRealFunction f)`	Return a function dividing the instance by another function.
`ComposableFunction`	`multiply(double scaleFactor)`	Return a function scaling the instance by a constant factor.
`ComposableFunction`	`multiply(UnivariateRealFunction f)`	Return a function multiplying the instance and another function.
`ComposableFunction`	`of(UnivariateRealFunction f)`	Precompose the instance with another function.
`ComposableFunction`	`postCompose(UnivariateRealFunction f)`	Postcompose the instance with another function.
`ComposableFunction`	`subtract(UnivariateRealFunction f)`	Return a function subtracting another function from the instance.
`abstract double`	`value(double x)`	Compute the value for the function.

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

- Field Detail
  - ZERO
```
public static final ComposableFunction ZERO
```
    The constant function always returning 0.
  - ONE
```
public static final ComposableFunction ONE
```
    The constant function always returning 1.
  - IDENTITY
```
public static final ComposableFunction IDENTITY
```
    The identity function.
  - ABS
```
public static final ComposableFunction ABS
```
    The FastMath.abs method wrapped as a ComposableFunction.
  - NEGATE
```
public static final ComposableFunction NEGATE
```
    The - operator wrapped as a ComposableFunction.
  - INVERT
```
public static final ComposableFunction INVERT
```
    The invert operator wrapped as a ComposableFunction.
  - SIN
```
public static final ComposableFunction SIN
```
    The FastMath.sin method wrapped as a ComposableFunction.
  - SQRT
```
public static final ComposableFunction SQRT
```
    The FastMath.sqrt method wrapped as a ComposableFunction.
  - SINH
```
public static final ComposableFunction SINH
```
    The FastMath.sinh method wrapped as a ComposableFunction.
  - EXP
```
public static final ComposableFunction EXP
```
    The FastMath.exp method wrapped as a ComposableFunction.
  - EXPM1
```
public static final ComposableFunction EXPM1
```
    The FastMath.expm1 method wrapped as a ComposableFunction.
  - ASIN
```
public static final ComposableFunction ASIN
```
    The FastMath.asin method wrapped as a ComposableFunction.
  - ATAN
```
public static final ComposableFunction ATAN
```
    The FastMath.atan method wrapped as a ComposableFunction.
  - TAN
```
public static final ComposableFunction TAN
```
    The FastMath.tan method wrapped as a ComposableFunction.
  - TANH
```
public static final ComposableFunction TANH
```
    The FastMath.tanh method wrapped as a ComposableFunction.
  - CBRT
```
public static final ComposableFunction CBRT
```
    The FastMath.cbrt method wrapped as a ComposableFunction.
  - CEIL
```
public static final ComposableFunction CEIL
```
    The FastMath.ceil method wrapped as a ComposableFunction.
  - FLOOR
```
public static final ComposableFunction FLOOR
```
    The FastMath.floor method wrapped as a ComposableFunction.
  - LOG
```
public static final ComposableFunction LOG
```
    The FastMath.log method wrapped as a ComposableFunction.
  - LOG10
```
public static final ComposableFunction LOG10
```
    The FastMath.log10 method wrapped as a ComposableFunction.
  - LOG1P
```
public static final ComposableFunction LOG1P
```
    The FastMath.log1p method wrapped as a ComposableFunction.
  - COS
```
public static final ComposableFunction COS
```
    The FastMath.cos method wrapped as a ComposableFunction.
  - ACOS
```
public static final ComposableFunction ACOS
```
    The FastMath.abs method wrapped as a ComposableFunction.
  - COSH
```
public static final ComposableFunction COSH
```
    The FastMath.cosh method wrapped as a ComposableFunction.
  - RINT
```
public static final ComposableFunction RINT
```
    The FastMath.rint method wrapped as a ComposableFunction.
  - SIGNUM
```
public static final ComposableFunction SIGNUM
```
    The FastMath.signum method wrapped as a ComposableFunction.
  - ULP
```
public static final ComposableFunction ULP
```
    The FastMath.ulp method wrapped as a ComposableFunction.
- Constructor Detail
  - ComposableFunction
```
public ComposableFunction()
```
- Method Detail
  - of
```
public ComposableFunction of(UnivariateRealFunction f)
```
    Precompose the instance with another function.
    The composed function h created by h = g.of(f) is such that h.value(x) == g.value(f.value(x)) for all x.
    
    Parameters:
    
    f - function to compose with
    
    Returns:
    
    a new function which computes this.value(f.value(x))
    
    See Also:
    
    postCompose(UnivariateRealFunction)
  - postCompose
```
public ComposableFunction postCompose(UnivariateRealFunction f)
```
    Postcompose the instance with another function.
    The composed function h created by h = g.postCompose(f) is such that h.value(x) == f.value(g.value(x)) for all x.
    
    Parameters:
    
    f - function to compose with
    
    Returns:
    
    a new function which computes f.value(this.value(x))
    
    See Also:
    
    of(UnivariateRealFunction)
  - combine
```
public ComposableFunction combine(UnivariateRealFunction f,
                                  BivariateRealFunction combiner)
```
    Return a function combining the instance and another function.
    The function h created by h = g.combine(f, combiner) is such that h.value(x) == combiner.value(g.value(x), f.value(x)) for all x.
    
    Parameters:
    
    f - function to combine with the instance
    
    combiner - bivariate function used for combining
    
    Returns:
    
    a new function which computes combine.value(this.value(x), f.value(x))
  - add
```
public ComposableFunction add(UnivariateRealFunction f)
```
    Return a function adding the instance and another function.
    
    Parameters:
    
    f - function to combine with the instance
    
    Returns:
    
    a new function which computes this.value(x) + f.value(x)
  - add
```
public ComposableFunction add(double a)
```
    Return a function adding a constant term to the instance.
    
    Parameters:
    
    a - term to add
    
    Returns:
    
    a new function which computes this.value(x) + a
  - subtract
```
public ComposableFunction subtract(UnivariateRealFunction f)
```
    Return a function subtracting another function from the instance.
    
    Parameters:
    
    f - function to combine with the instance
    
    Returns:
    
    a new function which computes this.value(x) - f.value(x)
  - multiply
```
public ComposableFunction multiply(UnivariateRealFunction f)
```
    Return a function multiplying the instance and another function.
    
    Parameters:
    
    f - function to combine with the instance
    
    Returns:
    
    a new function which computes this.value(x) * f.value(x)
  - multiply
```
public ComposableFunction multiply(double scaleFactor)
```
    Return a function scaling the instance by a constant factor.
    
    Parameters:
    
    scaleFactor - constant scaling factor
    
    Returns:
    
    a new function which computes this.value(x) * scaleFactor
  - divide
```
public ComposableFunction divide(UnivariateRealFunction f)
```
    Return a function dividing the instance by another function.
    
    Parameters:
    
    f - function to combine with the instance
    
    Returns:
    
    a new function which computes this.value(x) / f.value(x)
  - asCollector
```
public MultivariateRealFunction asCollector(BivariateRealFunction combiner,
                                            double initialValue)
```
    Generates a function that iteratively apply instance function on all elements of an array.
    The generated function behaves as follows:
    
    initialize result = initialValue
    
    iterate: result = combiner.value(result, this.value(nextMultivariateEntry));
    
    return result
    Parameters:
    
    combiner - combiner to use between entries
    
    initialValue - initial value to use before first entry
    
    Returns:
    
    a new function that iteratively apply instance function on all elements of an array.
  - asCollector
```
public MultivariateRealFunction asCollector(BivariateRealFunction combiner)
```
    Generates a function that iteratively apply instance function on all elements of an array.
    Calling this method is equivalent to call asCollector(BivariateRealFunction, 0.0).
    
    Parameters:
    
    combiner - combiner to use between entries
    
    Returns:
    
    a new function that iteratively apply instance function on all elements of an array.
    
    See Also:
    
    asCollector(BivariateRealFunction, double)
  - asCollector
```
public MultivariateRealFunction asCollector(double initialValue)
```
    Generates a function that iteratively apply instance function on all elements of an array.
    Calling this method is equivalent to call asCollector(BinaryFunction.ADD, initialValue).
    
    Parameters:
    
    initialValue - initial value to use before first entry
    
    Returns:
    
    a new function that iteratively apply instance function on all elements of an array.
    
    See Also:
    
    asCollector(BivariateRealFunction, double), BinaryFunction.ADD
  - asCollector
```
public MultivariateRealFunction asCollector()
```
    Generates a function that iteratively apply instance function on all elements of an array.
    Calling this method is equivalent to call asCollector(BinaryFunction.ADD, 0.0).
    
    Returns:
    
    a new function that iteratively apply instance function on all elements of an array.
    
    See Also:
    
    asCollector(BivariateRealFunction, double), BinaryFunction.ADD
  - value
```
public abstract double value(double x)
                      throws FunctionEvaluationException
```
    Compute the value for the function.
    
    Specified by:
    
    value in interface UnivariateRealFunction
    
    Parameters:
    
    x - the point for which the function value should be computed
    
    Returns:
    
    the value
    
    Throws:
    
    FunctionEvaluationException - if the function evaluation fails

Class ComposableFunction

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

ZERO

ONE

IDENTITY

ABS

NEGATE

INVERT

SIN

SQRT

SINH

EXP

EXPM1

ASIN

ATAN

TAN

TANH

CBRT

CEIL

FLOOR

LOG

LOG10

LOG1P

COS

ACOS

COSH

RINT

SIGNUM

ULP

Constructor Detail

ComposableFunction

Method Detail

of

postCompose

combine

add

add

subtract

multiply

multiply

divide

asCollector

asCollector

asCollector

asCollector

value