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/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
import java.util.Random;
/**
*Á£×ÓÀà
* Çó½âº¯Êý f(x)=x1^2+(x2-x3)^2 µÄ×î´óÖµ
* @author FashionXu
*/
public class Particle {
public double[] pos;//Á£×ÓµÄλÖã¬Çó½âÎÊÌâ¶àÉÙά£¬Ôò´ËÊý×éΪ¶àÉÙά
public double[] v;//Á£×ÓµÄËٶȣ¬Î¬ÊýͬλÖÃ
public double fitness;//Á£×ÓµÄÊÊÓ¦¶È
public double[] pbest;//Á£×ÓµÄÀúÊ·×îºÃλÖÃ
public static double[] gbest;//ËùÓÐÁ£×ÓÕÒµ½µÄ×îºÃλÖÃ
public static Random rnd;
public static int dims;
public static double w;
public static double c1;
public static double c2;
double pbest_fitness;//ÀúÊ·×îÓŽâ
/**
* ·µ»Ølow—uperÖ®¼äµÄÊý
* @param low ÏÂÏÞ
* @param uper ÉÏÏÞ
* @return ·µ»Ølow—uperÖ®¼äµÄÊý
*/
double rand(double low, double uper) {
rnd = new Random();
return rnd.nextDouble() * (uper - low) + low;
}
/**
* ³õʼ»¯Á£×Ó
* @param dim ±íʾÁ£×ÓµÄάÊý
*/
public void initial(int dim) {
pos = new double[dim];
v = new double[dim];
pbest = new double[dim];
fitness = -1e6;
pbest_fitness = -1e6;
dims = dim;
for (int i = 0; i < dim; ++i) {
pos[i] = rand(-10, 10);
pbest[i] = pos[i];
v[i] = rand(-20, 20);
}
}
/**
* ÆÀ¹Àº¯ÊýÖµ,ͬʱ¼Ç¼ÀúÊ·×îÓÅλÖÃ
*/
public void evaluate() {
fitness = pos[0] * pos[0] + (pos[1] - pos[2]) * (pos[1] - pos[2]);
if (fitness > pbest_fitness) {
for (int i = 0; i < dims; ++i) {
pbest[i] = pos[i];
}
}
}
/**
* ¸üÐÂËٶȺÍλÖÃ
*/
public void updatev() {
for (int i = 0; i < dims; ++i) {
v[i] = w * v[i] + c1 * rnd.nextDouble() * (pbest[i] - pos[