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@@ -17,3 +17,11 @@
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#
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[2 0 1 3]
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```
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以下、`pandas.cut` を使う方法。
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```python
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titanic['new_age'] = (
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pd.cut(titanic['Age'].fillna(99), bins=[0, 20, 40, 50, 100],
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right=False, labels=False)
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.map({0:1, 1:2, 2:3, 3:0}))
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```
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