numpy中矩阵的翻转(flip)

numpy.flip(m, axis=None)

Reverse the order of elements in an array along the given axis.
The shape of the array is preserved, but the elements are reordered.

把m在axis维度进行切片，并把这个维度的index进行颠倒

示例

随机生成一个二维数组

import  numpyas np
a=np.random.randint(1,9,size=9).reshape((3,3))

[[586][317][878]]

axis=0：上下翻转，意味着把行看成整体，行的顺序发生颠倒，每一行的元素不发生改变

print(np.flip(a,axis=0))

[[878][317][586]]

axis=1：左右翻转，意味着把列看成整体，列的顺序发生颠倒，每一列的元素不发生改变

print(np.flip(a,axis=1))

[[685][713][878]]