import matplotlib.pyplot as plt import numpy as np

数据

x = np.arange(300, 650, 50) y1 = [-0.2441,-0.2662,-0.2788,-0.2758,-0.2829,-0.2745,-0.2842] y2 = [-0.2375,-0.2565,-0.2666,-0.2564,-0.2609,-0.2514,-0.2651] y3 = [-0.2243,-0.2391,-0.2435,-0.2516,-0.2551,-0.2465,-0.2535]

折线图

plt.plot(x, y1, 'r-', label=r'$\mathit{P=6}$') plt.plot(x, y2, 'g-', label=r'$\mathit{P=7}$') plt.plot(x, y3, 'b-', label=r'$\mathit{P=8}$')

散点图

plt.scatter(x, y1, c='r', marker='o', s=20) plt.scatter(x, y2, c='g', marker='o', s=20) plt.scatter(x, y3, c='b', marker='o', s=20)

图例

plt.legend(loc='upper right')

标题和坐标轴

plt.xlabel('Customer scale', fontsize=12) plt.ylabel('Average customer delivery cost', fontsize=12) plt.tick_params(axis='both', which='major', labelsize=10) plt.tick_params(axis='both', which='minor', labelsize=10)

显示图形

plt.show(