rollaxis
此功能向后滚动指定的轴，直到它位于指定位置。 该函数有三个参数。
numpy.rollaxis(arr, axis, start)
Where,
| Sr.No. | 参数和描述 |
|---|---|
| 1 | arr 输入数组 |
| 2 | axis 轴向后滚动。 其他轴的位置不会相对于彼此改变 |
| 3 | start 默认为零，导致完整滚动。 滚动直到达到指定位置 |
例子 (Example)
# It creates 3 dimensional ndarray
import numpy as np
a = np.arange(8).reshape(2,2,2)
print 'The original array:'
print a
print '\n'
# to roll axis-2 to axis-0 (along width to along depth)
print 'After applying rollaxis function:'
print np.rollaxis(a,2)
# to roll axis 0 to 1 (along width to height)
print '\n'
print 'After applying rollaxis function:'
print np.rollaxis(a,2,1)
其输出如下 -
The original array:
[[[0 1]
[2 3]]
[[4 5]
[6 7]]]
After applying rollaxis function:
[[[0 2]
[4 6]]
[[1 3]
[5 7]]]
After applying rollaxis function:
[[[0 2]
[1 3]]
[[4 6]
[5 7]]]
