mikera.vectorz.ops

Class Logistic

java.lang.Object

mikera.vectorz.Op

mikera.vectorz.ops.ABoundedOp

mikera.vectorz.ops.Logistic

All Implemented Interfaces:

IOperator

public final class Logistic
extends ABoundedOp

Field Summary

Fields

Modifier and Type	Field and Description
static Logistic	INSTANCE

Constructor Summary

Constructors

Constructor and Description
Logistic()

Method Summary

Modifier and Type	Method and Description
double	apply(double x) Applies this operator to a single value, returning the result
double	applyInverse(double y) Applies the inverse of this Op.
void	applyTo(AVector v) Applies this operator to a mutable vector.
void	applyTo(double[] data, int start, int length) Applies this operator to the specified range within a double[] array.
double	averageValue()
double	derivative(double x) Returns the derivative of this Op for a given input value x i.e.
double	derivativeForOutput(double y) Returns the derivative of this Op for a given output value y i.e.
boolean	hasDerivative() Returns true if this operator supports computing the derivative for a given input
static double	logisticFunction(double a)
double	maxValue()
double	minValue()

Methods inherited from class mikera.vectorz.ops.ABoundedOp

isBounded

Methods inherited from class mikera.vectorz.Op

applyTo, applyTo, applyTo, applyTo, applyTo, applyTo, applyTo, compose, compose, constrainValues, divide, getDerivativeOp, getInverse, getTransform, hasDerivativeForOutput, hasInverse, isDomainBounded, isStochastic, maxDomain, minDomain, product, sum, toString, validateOutput

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

INSTANCE

public static final Logistic INSTANCE

Constructor Detail

Logistic

public Logistic()

Method Detail

logisticFunction

public static double logisticFunction(double a)

apply

public double apply(double x)

Description copied from interface: IOperator

Applies this operator to a single value, returning the result

Specified by:

apply in interface IOperator

Specified by:

apply in class Op

Returns:

applyInverse

public double applyInverse(double y)

Description copied from class: Op

Applies the inverse of this Op. Throws an error if the inverse function does not exist. Returns Double.NaN if no inverse exists for the specific value of y.

Overrides:

applyInverse in class Op

Returns:

applyTo

public void applyTo(double[] data,
                    int start,
                    int length)

Description copied from interface: IOperator

Applies this operator to the specified range within a double[] array.

Specified by:

applyTo in interface IOperator

Overrides:

applyTo in class Op

applyTo

public void applyTo(AVector v)

Description copied from interface: IOperator

Applies this operator to a mutable vector.

Specified by:

applyTo in interface IOperator

Overrides:

applyTo in class Op

hasDerivative

public boolean hasDerivative()

Description copied from class: Op

Returns true if this operator supports computing the derivative for a given input

Overrides:

hasDerivative in class Op

Returns:

derivativeForOutput

public double derivativeForOutput(double y)

Description copied from class: Op

Returns the derivative of this Op for a given output value y i.e. f'(g(y)) where f is the operator, g is the inverse of f

Overrides:

derivativeForOutput in class Op

Returns:

derivative

public double derivative(double x)

Description copied from class: Op

Returns the derivative of this Op for a given input value x i.e. f'(x) where f is the operator

Overrides:

derivative in class Op

Returns:

minValue

public double minValue()

Specified by:

minValue in class ABoundedOp

maxValue

public double maxValue()

Specified by:

maxValue in class ABoundedOp

averageValue

public double averageValue()

Overrides:

averageValue in class ABoundedOp