[英]un-slicing numpy arrays
Given a sliced numpy array as follows: 给定一个切片的numpy数组,如下所示:
b = [a[..., i] for i in a.shape[-1]]
What is the most simple way I can recreate a
from b
? 我可以从
b
重新创建a
的最简单方法是什么?
Something like: 就像是:
for i in range(a.shape[-1]):
c[..., i] = b[i]
Instead of that list comprehension, your original operation should have been 而不是列表理解,您原来的操作应该是
b = numpy.rollaxis(a, axis=-1)
which produces a view of a
as a new array instead of a list of arrays. 其产生的视图
a
作为新的数组,而不是阵列的列表。
The reverse operation is 反向操作是
c = numpy.rollaxis(b, axis=0, start=b.ndim)
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