画折线图代码

import matplotlib.pyplot as plt
import numpy as np

# Sample data
lambda1 = [0.01, 0.1, 1, 10, 100]
lambda2 = [0.01, 0.1, 1, 10, 100]
ssim_lambda1 = [0.840, 0.842, 0.846, 0.844, 0.841]
psnr_lambda1 = [28.975, 29.025, 29.100, 29.050, 29.000]
ssim_lambda2 = [0.842, 0.844, 0.846, 0.843, 0.841]
psnr_lambda2 = [28.700, 28.800, 29.200, 29.000, 28.800]

fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(12, 4))

# First plot
ax1.plot(lambda1, psnr_lambda1, 'r-o', label='PSNR')
ax1.set_xlabel(r'$\lambda_1$')
ax1.set_ylabel('PSNR', color='red')
ax1.tick_params(axis='y', labelcolor='red')
ax1.grid(True)

ax1_twin = ax1.twinx()
ax1_twin.plot(lambda1, ssim_lambda1, 'b-o', label='SSIM')
ax1_twin.set_ylabel('SSIM', color='blue')
ax1_twin.tick_params(axis='y', labelcolor='blue')

# Second plot
ax2.plot(lambda2, psnr_lambda2, 'r-o', label='PSNR')
ax2.set_xlabel(r'$\lambda_2$')
ax2.set_ylabel('PSNR', color='red')
ax2.tick_params(axis='y', labelcolor='red')
ax2.grid(True)

ax2_twin = ax2.twinx()
ax2_twin.plot(lambda2, ssim_lambda2, 'b-o', label='SSIM')
ax2_twin.set_ylabel('SSIM', color='blue')
ax2_twin.tick_params(axis='y', labelcolor='blue')

fig.tight_layout()
plt.show()

如下图：