Class CROperatorBilinearSplineND

java.lang.Object

org.ddogleg.chainrule.ops.CROperatorBilinearND

org.ddogleg.chainrule.ops.CROperatorBilinearSplineND

All Implemented Interfaces:

CROperatorBackwardsJac<double[]>, CROperatorForward<double[]>

public class CROperatorBilinearSplineND
extends CROperatorBilinearND

Implementation of CROperatorBilinearND where the knots are also splines which use linear interpolation.

A knot's coefficients are samples on a regular grid spanning valueMin to valueMax, so coefs samples make coefs - 1 buckets. Values outside that range are clamped to the nearest end rather than extrapolated, which bounds what this returns no matter what it is handed.

Field Summary

Fields

Modifier and Type	Field	Description
protected int	bucket	Which bucket the lower extent is in
protected double	bucketFrac1	The weight assigned to the upper end of the bucket.
double	valueMax	The min and max expected values of value
double	valueMin	The min and max expected values of value

Fields inherited from class CROperatorBilinearND

coefDeriv, IN_KNOT_0, IN_KNOT_1, IN_KNOT_2, IN_KNOT_3, IN_VALUE, IN_WEIGHTS, knots, math, value, workJac

Constructor Summary

Constructors

Constructor	Description
CROperatorBilinearSplineND()

Method Summary

Modifier and Type	Method	Description
CROperatorBilinearSplineND	configure(ConfigGridSplineND grid)
protected double	evaluate(int knot, int polyOffset)	Values the specified polynomial encoded in the knot using value.
protected double	evaluateDerivative(int knot, int polyOffset)	Piecewise linear, so this is the bucket's slope.
protected void	functionDerivatives(double[] derivatives)	Only the two samples bracketing the value contribute, and they contribute their interpolation weights.
Map<String,String>	getSettings()	Retrieve a serialized description of the settings
void	setSettings(Map<String,String> settings)	Reconfigures the block using the specified settings
protected void	setValue(double value)	Assigns the value

Methods inherited from class CROperatorBilinearND

configureGrid, forward, getArrayType, getInputCount, getInputSize, getOutputSize, jacobian, jacobianKnot, jacobianValue, jacobianWeights, knotOffset, setInput

Methods inherited from class Object

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

Methods inherited from interface CROperatorForward

normalizeAfterStep

Field Details

valueMin

public double valueMin

The min and max expected values of value

valueMax

public double valueMax

The min and max expected values of value

bucket

protected int bucket

Which bucket the lower extent is in

bucketFrac1

protected double bucketFrac1

The weight assigned to the upper end of the bucket. 0 to 1, inclusive

Constructor Details

CROperatorBilinearSplineND

public CROperatorBilinearSplineND()

Method Details

configure

public CROperatorBilinearSplineND configure(ConfigGridSplineND grid)

evaluate

protected double evaluate(int knot,
 int polyOffset)

Values the specified polynomial encoded in the knot using value.

Specified by:

evaluate in class CROperatorBilinearND

evaluateDerivative

protected double evaluateDerivative(int knot,
 int polyOffset)

Piecewise linear, so this is the bucket's slope. Exactly zero where the value clamped, since moving further out changes nothing

Specified by:

evaluateDerivative in class CROperatorBilinearND

functionDerivatives

protected void functionDerivatives(double[] derivatives)

Only the two samples bracketing the value contribute, and they contribute their interpolation weights. The rest of the knot is untouched by this observation

Specified by:

functionDerivatives in class CROperatorBilinearND

setValue

protected void setValue(double value)

Description copied from class: CROperatorBilinearND

Assigns the value

Overrides:

setValue in class CROperatorBilinearND

getSettings

public Map<String,String> getSettings()

Description copied from interface: CROperatorForward

Retrieve a serialized description of the settings

Specified by:

getSettings in interface CROperatorForward<double[]>

Overrides:

getSettings in class CROperatorBilinearND

setSettings

public void setSettings(Map<String,String> settings)

Description copied from interface: CROperatorForward

Reconfigures the block using the specified settings

Specified by:

setSettings in interface CROperatorForward<double[]>

Overrides:

setSettings in class CROperatorBilinearND