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Version 3.1.1
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标注绘图

此示例演示如何使用指向所提供坐标的箭头注释绘图。我们将箭头的默认值修改为“收缩”。

有关注释功能的完整概述,请参见 annotation tutorial .

import numpy as np
import matplotlib.pyplot as plt

fig, ax = plt.subplots()

t = np.arange(0.0, 5.0, 0.01)
s = np.cos(2*np.pi*t)
line, = ax.plot(t, s, lw=2)

ax.annotate('local max', xy=(2, 1), xytext=(3, 1.5),
            arrowprops=dict(facecolor='black', shrink=0.05),
            )
ax.set_ylim(-2, 2)
plt.show()
标注绘图