回答編集履歴
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追記
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@@ -68,7 +68,7 @@
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d = [[*x, *y, *z] for x, y, z in zip(a, b, c)]
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d = [[*x, *y, *z] for x, y, z in zip(a, b, c)] # [*x, *y, *z]じゃなくてx+y+zでいいかな・・・
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print(d) # [[1, 4, 7], [2, 5, 8], [3, 6, 9]]
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修正
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書き方としては、こんな感じでどうでしょうか。
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```python
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修正
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この回答を投稿した時点で質問文には
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> ```python
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> a=[[1][2][3]]
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> b=[[4][5][6]]
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> c=[[7][8][9]]
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>
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> ```
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> ```python
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> d=[[1,4,7][2,5,8][3,6,9]]
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> ```
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numpy配列を水平方向に結合したい場合は、`numpy.hstack`が便利です。
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```python
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>>> import numpy as np
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>>> data1 = np.array([[56], [102], [117], [142]])
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>>> data2 = np.array([[55], [122], [176], [154]])
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>>> data1
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array([[ 56],
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[102],
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[117],
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[142]])
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>>> data2
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array([[ 55],
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[122],
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[176],
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[154]])
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>>> data3 = np.hstack([data1, data2])
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>>> data3
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array([[ 56, 55],
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[102, 122],
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[117, 176],
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[142, 154]])
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```python
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[numpy.hstack — NumPy v1.17 Manual](https://docs.scipy.org/doc/numpy/reference/generated/numpy.hstack.html)
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```
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だと仮定します。
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#### 不要になった回答
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---
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