英文:
how to make each element in an array another array
问题
你好，我遇到一个问题。我有一个大小为（256，144）的NumPy数组。该数组中的每个元素都是0。现在我想将数组中的每个元素都设置为[0, 0, 0]。有没有办法可以做到这一点？
以下是代码部分，不需要翻译：
empty_windows = np.zeros((256, 144))
for i in range(256):
for j in range(144):
empty_windows[i, j] = [0, 0, 0]
这种方法不起作用，因为它会返回一个错误消息"ValueError: setting an array element with a sequence."
有没有办法可以实现这个目标？非常感谢。
英文:
Hi I came across a problem. I have a numpy array with size (256, 144). Each element is 0 in this array. Now I want to make each element in the array to be [0, 0, 0]. Is there a way of doing this?
The code is:
empty_windows = np.zeros(256, 144)
for i in range(256*144):
empty_windows[i] = [0,0,0]
This method doesnt work as it returns an error message "ValueError: setting an array element with a sequence."
Is there a way of doing this? Thank you very much.
答案1
得分: 1
如果您不需要在empty_windows的大小为(256, 144)时执行任何操作，您可以简单地创建具有正确大小的数组：
empty_windows = np.zeros((256, 144, 3))
英文:
If you don't need to do anything with empty_windows while it has size (256, 144), you can simply create it with the proper size:
empty_windows = np.zeros((256, 144, 3))
答案2
得分: 0
你可以尝试创建一个具有所需形状的第二个numpy数组，这在你的情况下是(256,144,3)，然后迭代它并根据需要修正元素。
empty_windows = np.zeros((256, 144))
x = np.random.rand(256, 144, 3)
for i in range(256):
for j in range(144):
x[i][j] = [empty_windows[i][j] for _ in range(3)]
empty_windows = x
你可能还希望重新熟悉一下numpy数组的使用，正如评论中提到的，特别是如何初始化和迭代它们。
英文:
You could try creating a second numpy array with the required shape, which in your case is (256,144,3) , iterating over it and correcting the elements as required.
empty_windows = np.zeros((256, 144))
x = np.random.rand(256,144,3)
for i in range(256):
for j in range(144):
x[i][j] = [empty_windows[i][j] for _ in range(3)]
empty_windows = x
You may also want to brush up on your understanding of numpy arrays, as the commenter mentioned, particularly how to initialize and iterate over them.
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