时间序列基础

def solve():
    import matplotlib
    matplotlib.use('Agg')
    import matplotlib.pyplot as plt
    import numpy as np
    # 生成模拟时间序列
    np.random.seed(42)
    t = np.arange(100)
    y = np.sin(2 * np.pi * t / 12) + 0.1 * t + np.random.randn(100) * 0.3
    plt.figure(figsize=(10, 4))
    plt.plot(t, y)
    plt.title('Time Series')
    plt.tight_layout()
    plt.show()
    print(len(y))