import random

import numpy as np
from matplotlib import pyplot as plt

def gauss_noisy(x, y):
    """
    對輸入數據加入高斯噪聲
    :param x: x軸數據
    :param y: y軸數據
    :return:
    """
    mu = 0
    sigma = 0.05
    for i in range(len(x)):
        x[i] += random.gauss(mu, sigma)
        y[i] += random.gauss(mu, sigma)

if __name__ == '__main__':
    # 在0-5的區間上生成50個點作為測試數據
    xl = np.linspace(0, 5, 50, endpoint=True)
    yl = np.sin(xl)

    # 加入高斯噪聲
    gauss_noisy(xl, yl)

    # 畫出這些點
    plt.plot(xl, yl, linestyle='', marker='.')
    plt.show()