io.jenetics.ext.moea

Interface ElementDistance<V>

Type Parameters:

V - the vector type

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface ElementDistance<V>

Defines the distance of two elements of a given vector type V. The following example creates an ElementDistance function for a double[] array:

final ElementDistance<double[]> dist = (u, v, i) -> u[i] - v[i];

Since:

4.1

Version:

4.1

Author:

Franz Wilhelmstötter

Method Summary

Modifier and Type	Method and Description
double	distance(V u, V v, int index) Calculates the distance of two vector elements at the given index.
default <T> ElementDistance<T>	map(Function<? super T,? extends V> mapper) Return an element distance function for the mapped type T.
default ToDoubleBiFunction<V,V>	ofIndex(int index) Return a function which calculates the distance of two vector elements at a given index.

Method Detail

distance

double distance(V u,
                V v,
                int index)

Calculates the distance of two vector elements at the given index. E.g.

final ElementDistance<double[]> dist = (u, v, i) -> u[i] - v[i];

Parameters:

u - the first vector

v - the second vector

index - the vector index

Returns:

the distance of the two element vectors

map

default <T> ElementDistance<T> map(Function<? super T,? extends V> mapper)

Return an element distance function for the mapped type T.

Type Parameters:

T - the new distance type

Parameters:

mapper - the mapper function

Returns:

an element distance function for the mapped type T

ofIndex

default ToDoubleBiFunction<V,V> ofIndex(int index)

Return a function which calculates the distance of two vector elements at a given index.

Parameters:

index - the vector index

Returns:

a function which calculates the distance of two vector elements