annutil.java

来自「人工神经网络BP算法」· Java 代码 · 共 40 行

package BPAnn;

import java.util.Random;

class ANNUtil {
    private static Random rand = new Random();

    public static int randInteger(int max) {
        return rand.nextInt(max);
    }
    public static int randInteger(int min, int max) {
        if (min == max) {
            return min;
        }
        if (min > max) {
            int tmp = min;
            min = max;
            max = tmp;
        }
        return randInteger(max-min) + min;
    }
    public static double randDouble(double min, double max) {
        if (min == max) {
            return min;
        }
        if (min > max) {
            double tmp = min;
            min = max;
            max = tmp;
        }
        double r = rand.nextDouble();
        r = min + (max - min) * r;
        return r;
    } 
    
    public static double sigmoid(double v) {
        return 1.0 / (1 + Math.pow(Math.E, -v));
    }
}