【发布时间】:2018-06-17 21:06:59
【问题描述】:
我有这个数组:
import numpy as np
shape = (3, 2, 2)
x = np.round(np.random.rand(*shape) * 100)
y = np.round(np.random.rand(*shape) * 100)
z = np.round(np.random.rand(*shape) * 100)
w = np.round(np.random.rand(*shape) * 100)
first_stacked = np.stack((x, y, z, w), axis=0)
print(first_stacked.shape) # (4, 3, 2, 2)
我想转换成这个数组:
import numpy as np
shape = (3, 2, 2)
x = np.round(np.random.rand(*shape) * 100)
y = np.round(np.random.rand(*shape) * 100)
z = np.round(np.random.rand(*shape) * 100)
w = np.round(np.random.rand(*shape) * 100)
last_stacked = np.stack((x, y, z, w), axis=-1)
print(last_stacked.shape) # (3, 2, 2, 4)
我试过了:
new_stacked = [i for i in first_stacked]
new_stacked = np.stack(new_stacked, axis=-1)
other_stacked = np.stack(first_stacked, axis=-1)
print(new_stacked.shape)
print(other_stacked.shape)
print(np.array_equal(new_stacked, last_stacked))
print(np.array_equal(new_stacked, other_stacked))
输出:
(3, 2, 2, 4)
(3, 2, 2, 4)
False
True
所以我的两次尝试都没有奏效。我错过了什么?可以只用first_stacked 上的reshape 来完成吗?我担心我的数组是否太大,如果它不仅仅是重塑,这可能是个问题,尽管我的担心可能是没有根据的。
编辑:我在 Jupyter Notebook 中对 x、y、z、w 数组进行了两次随机化,第二个值显然不等于第一个。我道歉。虽然如果有更好的方法,我仍然很感兴趣。
所以,工作代码:
import numpy as np
shape = (3, 2, 2)
x = np.round(np.random.rand(*shape) * 100)
y = np.round(np.random.rand(*shape) * 100)
z = np.round(np.random.rand(*shape) * 100)
w = np.round(np.random.rand(*shape) * 100)
first_stacked = np.stack((x, y, z, w), axis=0)
print(first_stacked.shape)
last_stacked = np.stack((x, y, z, w), axis=-1)
print(last_stacked.shape)
new_stacked = [i for i in first_stacked]
new_stacked = np.stack(new_stacked, axis=-1)
other_stacked = np.stack(first_stacked, axis=-1)
print(new_stacked.shape)
print(other_stacked.shape)
print(np.array_equal(new_stacked, last_stacked))
print(np.array_equal(new_stacked, other_stacked))
输出:
(4, 3, 2, 2)
(3, 2, 2, 4)
(3, 2, 2, 4)
(3, 2, 2, 4)
True
True
【问题讨论】:
标签: python arrays python-3.x numpy multidimensional-array