com.numericalmethod.suanshu.number.doublearray

Class CompositeDoubleArrayOperation

java.lang.Object

com.numericalmethod.suanshu.number.doublearray.CompositeDoubleArrayOperation

All Implemented Interfaces:

DoubleArrayOperation, java.io.Serializable

public class CompositeDoubleArrayOperation
extends java.lang.Object
implements DoubleArrayOperation

It is desirable to have multiple implementations and switch between them for, e.g., performance reason.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	CompositeDoubleArrayOperation.ImplementationChooser Specify which implementation to use.

Constructor Summary

Constructors

Constructor and Description
CompositeDoubleArrayOperation(CompositeDoubleArrayOperation.ImplementationChooser chooser) Construct a CompositeDoubleArrayOperation by supplying the multiplexing criterion and the multiple DoubleArrayOperations.
CompositeDoubleArrayOperation(int arrayLengthThreshold, DoubleArrayOperation impl1, DoubleArrayOperation impl2) Construct a CompositeDoubleArrayOperation that chooses an implementation by array length.

Method Summary

Modifier and Type	Method and Description
double[]	add(double[] arr1, double[] arr2) Add two double arrays.
double[]	minus(double[] arr1, double[] arr2) Subtract one double array from another.
double[]	scaled(double[] arr, double c) Scale a double array.

Methods inherited from class java.lang.Object

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

Constructor Detail

CompositeDoubleArrayOperation

public CompositeDoubleArrayOperation(CompositeDoubleArrayOperation.ImplementationChooser chooser)

Construct a CompositeDoubleArrayOperation by supplying the multiplexing criterion and the multiple DoubleArrayOperations.

Parameters:

chooser - an CompositeDoubleArrayOperation.ImplementationChooser

CompositeDoubleArrayOperation

public CompositeDoubleArrayOperation(int arrayLengthThreshold,
                                     DoubleArrayOperation impl1,
                                     DoubleArrayOperation impl2)

Construct a CompositeDoubleArrayOperation that chooses an implementation by array length.

Parameters:

arrayLengthThreshold - the array length threshold to switch implementation

impl1 - implementation 1

impl2 - implementation 2

Method Detail

add

public double[] add(double[] arr1,
                    double[] arr2)

Description copied from interface: DoubleArrayOperation

Add two double arrays.

Specified by:

add in interface DoubleArrayOperation

Parameters:

arr1 - an array double[]

arr2 - an array double[]

Returns:

the sum of the two arrays

minus

public double[] minus(double[] arr1,
                      double[] arr2)

Description copied from interface: DoubleArrayOperation

Subtract one double array from another.

Specified by:

minus in interface DoubleArrayOperation

Parameters:

arr1 - an array double[]

arr2 - an array double[]

Returns:

the difference of the two arrays

scaled

public double[] scaled(double[] arr,
                       double c)

Description copied from interface: DoubleArrayOperation

Scale a double array.

Specified by:

scaled in interface DoubleArrayOperation

Parameters:

arr - an array double[]

c - a scaling constant

Returns:

the scaled array