package psoAlgoCode;

import java.util.Random;
import java.util.Vector;

public class RandomFunctions {

	static Random random = new Random();

	public static Vector<Object> nextDoubles(int dimension) {
		Vector<Object> result = new Vector<Object>();
		for (int i = 0; i < dimension; i++) {
			result.addElement(Function.lowerLimit + random.nextDouble() * (Function.upperLimit * 2));
		}
		return result;
	}

	public static Vector<Object> nextRandoms(int dimension) {
		Vector<Object> result = new Vector<Object>();
		for (int i = 0; i < dimension; i++) {
			result.addElement(random.nextDouble());
		}
		return result;
	}

	public static Vector<Object> nextBoolean(int dimension) {
		Vector<Object> result = new Vector<Object>();
		for (int i = 0; i < dimension; i++) {
			result.addElement(random.nextBoolean());
		}
		return result;
	}

	// The paper Modified binary particle swarm optimization from S. Lee states that
	// phi is a random number between 2.4 and 2.01
	public static double randomPhi() {
		double result = 0.0;
		result = (random.nextDouble() * (2.4 - 2.01)) + 2.01;
		return result;
	}

}