파이썬 이미지 여러개 그리기

import numpy as np
import matplotlib.pyplot as plt

width=5
height=5
rows = 2
cols = 2

x=np.linspace(0,3,100)
y1=np.sin(x)
y2=1/(1+np.exp(-x))

figure, axes = plt.subplots(nrows=rows, ncols=cols)

for a, b in enumerate(axes.flat):
    image = np.random.randint(7, size=(height,width))
    b.imshow(image, alpha=0.25)
    r = a // cols
    c = a % cols
    subtitle="Row:"+str(r)+", Col:"+str(c)
    b.set_title(subtitle)

axes[0][1].plot(x, y1)
axes[1][1].plot(x,y2)

figure.tight_layout()
plt.show()

figure, axes = plt.subplots(nrows=2, ncols=2, figsize = (21, 9))

axes[0][0].set_title('sdkflsdkfj')
axes[0][0].plot([1, 2], [3, 10])
plt.title('sdkflsdkfj')
axes[0][1].plot([1, 2], [3, 10])
axes[1][0].plot([1, 2], [3, 10])
axes[1][1].plot([1, 2], [3, 10])
figure.colorbar;

figure.tight_layout()
plt.show()