基于Java实现粒子群PSO算法优化改进（源码）.rar

package pso; import java.util.ArrayList; import java.util.List; public class Particle { //限制界限 final List<Double> min; final List<Double> max; List<Double> maxVelocity; final int dimensions; final int maxGeneration; String name; List<Double> velocity; List<Double> coordinate; double score; int generation; //加速系数 double c1; double c2; //惯性系数 double w; List<Double> bestCoordinate; double bestScore; //产生了本粒子新的最优解，返回true boolean getScore(){ score = Problem.function4(coordinate,dimensions); boolean flag = score > bestScore; if (flag){ bestScore = score; bestCoordinate = new ArrayList<>(coordinate); } return flag; } void update(Particle bestParticle){ generation++; updateVelocity(bestParticle.bestCoordinate); updateCoordinate(); updateWeight(); getScore(); } void updateWeight() { w -= (0.5/maxGeneration); } void updateVelocity(List<Double> pg){ double newV = 0.0; for (int i = 0; i < dimensions; i++) { double r1 = Math.random(); double r2 = Math.random(); newV = w*velocity.get(i); newV += r1*c1*(bestCoordinate.get(i)-coordinate.get(i)); newV += r2*c2*(pg.get(i)-coordinate.get(i)); //不能超速 if(newV > maxVelocity.get(i)) newV = maxVelocity.get(i); if(newV < -maxVelocity.get(i)) newV = -maxVelocity.get(i); velocity.set(i,newV); } } void updateCoordinate(){ double newX = 0.0; for (int i = 0; i < dimensions; i++) { newX = coordinate.get(i) + velocity.get(i); //不能越界 if(newX > max.get(i)) newX = max.get(i); if(newX < min.get(i)) newX = min.get(i); coordinate.set(i,newX); } } void initialCoordinate(){ coordinate = new ArrayList<>(); for (int i = 0; i < dimensions; i++) { double d = (max.get(i)- min.get(i))*Math.random() + min.get(i); coordinate.add(d); } } void initialVelocity(){ velocity = new ArrayList<>(); for (int i = 0; i < dimensions; i++) { double d = 2*(maxVelocity.get(i))*Math.random()-maxVelocity.get(i); velocity.add(d); } } public Particle(List<Double> min, List<Double> max, List<Double> maxVelocity, int dimensions, int maxGeneration, double c1, double c2, double w,String name) { this.min = min; this.max = max; this.maxVelocity = maxVelocity; this.dimensions = dimensions; this.maxGeneration = maxGeneration; this.c1 = c1; this.c2 = c2; this.w = w; this.name = name; generation = 0; initialCoordinate(); initialVelocity(); getScore(); bestScore = score; bestCoordinate = new ArrayList<>(coordinate); } //绘图用的 public Particle(String name, List<Double> velocity, List<Double> coordinate, double score) { this.min = null; this.max = null; this.dimensions = 0; this.maxGeneration = 0; this.name = name; this.velocity = new ArrayList<>(velocity); this.coordinate = new ArrayList<>(coordinate); this.score = score; } @Override public String toString() { return "Particle{" + "name='" + name + '\'' + ", velocity=" + velocity + ", coordinate=" + coordinate + ", score=" + score + // ", generation=" + generation + // ", bestCoordinate=" + bestCoordinate + // ", bestScore=" + bestScore + "}\n"; } }