如何有效率地多次重複列表元素？

Efficiently Repeating List Elements

When faced with the task of repeating each element of a list multiple times, many approaches come to mind. However, finding a simple yet computationally efficient solution can be challenging.

One common approach, mentioned in the question, involves using the "*" operator. However, as pointed out, it simply multiplies the list by the specified number, resulting in an undesirable outcome. Another attempt, involving loops and nested multiplication, is also inadequate.

The most efficient solution lies in leveraging the power of numpy, a powerful library for numerical operations. Using the numpy.repeat function, we can achieve the desired result with utmost simplicity.

For example, consider the input list x = [1,2,3,4] and the desired repetition factor n = 3. To create a new list x1 that contains each element of x repeated three times, we can use the following code:

<code class="python">import numpy as np
x1 = np.repeat(x, 3)</code>

The output, as expected, will be:

array([1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4, 4])

Numpy's repeat function is not only concise and easy to use but also highly efficient, making it the ideal choice for this task.

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