创建多维零 Python
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Create Multidimensional Zeros Python
提问by Sameer Patel
I need to make a multidimensional array of zeros.
我需要制作一个多维零数组。
For two (D=2) or three (D=3) dimensions, this is easy and I'd use:
对于两个 (D=2) 或三个 (D=3) 维度，这很容易，我会使用：
a = numpy.zeros(shape=(n,n))
or
或者
a = numpy.zeros(shape=(n,n,n))
How for I for higher D, make the array of length n?
对于更高的 D，我如何制作长度为 n 的数组？
采纳答案by mgilson
You can multiply a tuple (n,)by the number of dimensions you want. e.g.:
您可以将元组乘以(n,)所需的维数。例如：
>>> import numpy as np
>>> N=2
>>> np.zeros((N,)*1)
array([ 0., 0.])
>>> np.zeros((N,)*2)
array([[ 0., 0.],
[ 0., 0.]])
>>> np.zeros((N,)*3)
array([[[ 0., 0.],
[ 0., 0.]],
[[ 0., 0.],
[ 0., 0.]]])
回答by ev-br
>>> sh = (10, 10, 10, 10)
>>> z1 = zeros(10000).reshape(*sh)
>>> z1.shape
(10, 10, 10, 10)
EDIT: while above is not wrong, it's just excessive. @mgilson's answer is better.
编辑：虽然上面没有错，但它只是过分了。@mgilson 的回答更好。
回答by NPE
In [4]: import numpy
In [5]: n = 2
In [6]: d = 4
In [7]: a = numpy.zeros(shape=[n]*d)
In [8]: a
Out[8]:
array([[[[ 0., 0.],
[ 0., 0.]],
[[ 0., 0.],
[ 0., 0.]]],
[[[ 0., 0.],
[ 0., 0.]],
[[ 0., 0.],
[ 0., 0.]]]])
回答by Marko
you can make multidimensional array of zeros by using square brackets
您可以使用方括号制作多维零数组
array_4D = np.zeros([3,3,3,3])
