练习题第四题
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# 练习题4: 使用布尔索引
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# 题目: 有一个NumPy数组 a = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]]) ,
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# 请使用布尔索引获取所有大于5的元素。
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import numpy as np
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a = np.array([[1, 2, 3], [4, 5, 6], [7, 8, 9]])
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print(a[a > 5])
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