Wie schreibe ich eine stückweise Python-Funktion?

#!/usr/bin/python # -*- coding:utf-8 -*- import numpy as np import matplotlib.pyplot as plt #绘制分段函数：y=4sin(4πt)-sgn(t-0.3)-sgn(0.72-t) def sgn(x): if x > 0: return 1 elif x < 0: return -1 else: return 0 t = np.arange(0, 1, 0.01) y = [] for i in t: y_1 = 4 * np.sin(4 * np.pi * i) - sgn(i - 0.3) - sgn(0.72 - i) y.append(y_1) plt.plot(t, y) plt.xlabel("t") plt.ylabel("y") plt.title("Heavsine") plt.show()

#!/usr/bin/python # -*- coding:utf-8 -*- import numpy as np import matplotlib.pyplot as plt def sgn(value): if value < 4: return 20 else: return 15 plt.figure(figsize=(6, 4)) x = np.linspace(0, 8, 100) y = np.array([]) for v in x: y = np.append(y, np.linspace(sgn(v), sgn(v), 1)) l = plt.plot(x, y, 'b', label='type') plt.legend() plt.show()

#!/usr/bin/python # -*- coding:utf-8 -*- import numpy as np import matplotlib.pyplot as plt def triangle_wave(x, c, c0, hc): x = x - int(x) #三角波周期为1 因此只取小数部分进行计算 if x < c0: return x / c0 * hc elif x >= c: return 0.0 else: return (c-x)/(c-c0)*hc x = np.linspace(0, 2, 1000) y = np.array([triangle_wave(t, 0.6, 0.4, 1.0) for t in x]) plt.figure() plt.plot(x, y) plt.ylim(-0.2, 1.2) #限制y的范围 plt.show()