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Update 第09章 绘图和可视化.md
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第09章 绘图和可视化.md

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@@ -84,7 +84,7 @@ In [20]: plt.plot(np.random.randn(50).cumsum(), 'k--')
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"k--"是一个线型选项,用于告诉matplotlib绘制黑色虚线图。上面那些由fig.add_subplot所返回的对象是AxesSubplot对象,直接调用它们的实例方法就可以在其它空着的格子里面画图了,如图9-4所示:
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```python
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In [21]: _ = ax1.hist(np.random.randn(100), bins=20, color='k', alpha=0.3)
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In [21]: ax1.hist(np.random.randn(100), bins=20, color='k', alpha=0.3)
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In [22]: ax2.scatter(np.arange(30), np.arange(30) + 3 * np.random.randn(30))
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```

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