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matplotlib & pandas
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Python/matplotlab/gallery/pyplots/annotation_basic.md
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Python/matplotlab/gallery/pyplots/annotation_basic.md
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# 注释一个图像
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此示例显示如何使用指向提供的坐标的箭头注释绘图。我们修改箭头的默认值,以“缩小”它。
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有关注释功能的完整概述,另请参阅[注释教程](https://matplotlib.org/tutorials/text/annotations.html)。
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```python
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import numpy as np
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import matplotlib.pyplot as plt
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fig, ax = plt.subplots()
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t = np.arange(0.0, 5.0, 0.01)
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s = np.cos(2*np.pi*t)
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line, = ax.plot(t, s, lw=2)
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ax.annotate('local max', xy=(2, 1), xytext=(3, 1.5),
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arrowprops=dict(facecolor='black', shrink=0.05),
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)
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ax.set_ylim(-2, 2)
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plt.show()
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```
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## 参考
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此示例中显示了以下函数,方法,类和模块的使用:
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```python
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import matplotlib
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matplotlib.axes.Axes.annotate
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matplotlib.pyplot.annotate
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```
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## 下载这个示例
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- [下载python源码: annotation_basic.py](https://matplotlib.org/_downloads/annotation_basic.py)
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- [下载Jupyter notebook: annotation_basic.ipynb](https://matplotlib.org/_downloads/annotation_basic.ipynb)
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