回答編集履歴
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テストコード追加
answer
CHANGED
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@@ -1,7 +1,25 @@
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ご確認ください。
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```python
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4
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def mode_n_expansion(x, n):
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x = np.asarray(x)
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if n <= 0 or n % 1 != 0 or x.ndim < n:
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raise ValueError((x.shape, n))
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return np.moveaxis(x, int(n) - 1, -1).T.reshape(x.shape[int(n) - 1], -1)
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```
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テストコード:
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```python
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def test_mode_n_expand():
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X = np.random.random(np.random.randint(1, 5, np.random.randint(3, 5)))
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for n in range(X.ndim):
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import itertools as it
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for i in it.product(*map(range, X.shape)):
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Y = mode_n_expansion(X, n=n + 1)
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j = int(sum(
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i_k * np.product([I_m for m, I_m in enumerate(X.shape[:k]) if m != n])
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for k, i_k in enumerate(i)
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if k != n
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))
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assert X[i] == Y[i[n], j]
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25
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```
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