mikera.vectorz.ops

Class Log

java.lang.Object

mikera.vectorz.Op

mikera.vectorz.ops.AFunctionOp

mikera.vectorz.ops.Log

All Implemented Interfaces:

ITransform, IOp

public final class Log
extends AFunctionOp

The renowned exponential function

Author:

Mike

Field Summary

Fields

Modifier and Type	Field and Description
static Op	INSTANCE

Constructor Summary

Constructors

Constructor and Description
Log()

Method Summary

Methods

Modifier and Type	Method and Description
double	apply(double x) Applies the operator to a single value, returning the result
double	applyInverse(double y) Applies the inverse of this Op.
void	applyTo(double[] data, int offset, int length)
void	applyTo(INDArray a)
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.
Op	getDerivativeOp()
Op	getInverse()
boolean	hasDerivative()
boolean	hasInverse()
double	minDomain()

Methods inherited from class mikera.vectorz.ops.AFunctionOp

averageValue

Methods inherited from class mikera.vectorz.Op

applyTo, applyTo, applyTo, applyTo, applyTo, applyTo, compose, compose, constrainValues, divide, getTransform, hasDerivativeForOutput, inputDimensions, isBounded, isDomainBounded, isStochastic, maxDomain, maxValue, minValue, outputDimensions, product, sum, toString, transform, validateOutput

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final Op INSTANCE

Constructor Detail

Log

public Log()

Method Detail

apply

public double apply(double x)

Description copied from interface: IOp

Applies the operator to a single value, returning the result

Specified by:

apply in interface IOp

Specified by:

apply in class Op

Returns:

applyTo

public void applyTo(INDArray a)

Overrides:

applyTo in class Op

applyTo

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

Specified by:

applyTo in interface IOp

Overrides:

applyTo in class Op

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:

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:

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:

hasDerivative

public boolean hasDerivative()

Overrides:

hasDerivative in class Op

hasInverse

public boolean hasInverse()

Overrides:

hasInverse in class Op

minDomain

public double minDomain()

Overrides:

minDomain in class Op

getInverse

public Op getInverse()

Specified by:

getInverse in interface IOp

Overrides:

getInverse in class Op

getDerivativeOp

public Op getDerivativeOp()

Overrides:

getDerivativeOp in class Op