分段函数图像

def solve():
    import matplotlib.pyplot as plt
    import numpy as np
    x = np.linspace(____)
    y = np.where(____)
    plt.figure(figsize=(____, ____))
    plt.plot(____)
    plt.xlabel(____)
    plt.ylabel(____)
    plt.title(____)
    plt.grid(____)
    plt.axhline(____, color='____', linewidth=____)
    plt.axvline(____, color='____', linewidth=____)
    plt.show()