Matplotlib add_subplot does not add to the expected position

Question

fig = plt.figure(figsize=(10,30))
ax1 = fig.add_subplot(1,1,1)
ax2 = fig.add_subplot(2,1,2)
ax3 = fig.add_subplot(3,1,3)

ax1.imshow(np.ones((100,200,3))) # white
ax2.imshow(np.zeros((100,200,3))) # black
ax3.imshow(np.zeros((100,200,3))) # black

The above code yields the below image

ax1 the white image is where I expected to be. the ax2, ax3, the black images are overlapped with each other

samol · Accepted Answer · 2018-06-15 16:49:20Z

1

Figured it out! Turns out add_subplot requires the overal dimensions. So the correct way to write it this

fig = plt.figure(figsize=(10,15))
ax1 = fig.add_subplot(3,1,1)
ax2 = fig.add_subplot(3,1,2)
ax3 = fig.add_subplot(3,1,3)

answered Jun 15, 2018 at 16:49

samol

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