擅长:python、mysql、java
<p>怎么样(基本上是从文档中取出的<a href="http://matplotlib.org/users/annotations_intro.html" rel="nofollow noreferrer">http://matplotlib.org/users/annotations_intro.html</a>)</p>
<pre><code>import numpy as np
import matplotlib.pyplot as plt
fig = plt.figure()
ax = fig.add_subplot(111)
t = np.arange(0.0, 5.0, 0.01)
s = np.cos(2*np.pi*t)
line, = ax.plot(t, s, lw=2)
coords_to_annote = [(2,1),(3,1),(4,1)]
for coords in coords_to_annote:
ax.annotate('local max', xy=coords, xytext=(3, 1.5),
arrowprops=dict(facecolor='black', shrink=0.05),
)
ax.set_ylim(-2,2)
plt.show()
</code></pre>
<p><img src="https://i.stack.imgur.com/kGPWE.png" alt="enter image description here"/></p>