matplotlib学习之figure、subplot画图

import matplotlib.pyplot as plt
import matplotlib
import numpy as np

x = np.arange(1,20)

fg = plt.figure()
ax = fg.add_subplot(221)
ax.plot(x,x)

ax = fg.add_subplot(222)
ax.plot(x, x*x)

ax = fg.add_subplot(223)
ax.plot(x,-x)

ax = fg.add_subplot(224)
ax.plot(x,np.log(x))

plt.show()