如何使用numpy的矩阵分成4个象限中蟒(how to split matrix into 4 qu

我是新来的Python。 我想实现的Strassen的算法。 矩阵的大小将始终是2在我的执行权力。 所以，我怎么划分的矩阵为4个大小相等的象限？ 谢谢

Answer 1:

>>> xs = np.arange(16)
>>> xs
array([ 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15])
>>> xs.reshape(4, 4)
array([[ 0,  1,  2,  3],
       [ 4,  5,  6,  7],
       [ 8,  9, 10, 11],
       [12, 13, 14, 15]])
>>> xs = xs.reshape(4, 4)
>>> a, b, c, d = xs[:2, :2], xs[2:, :2], xs[:2, 2:], xs[2:, 2:]
>>> print(a, b, c, d, sep='\n')
[[0 1]
 [4 5]]
[[ 8  9]
 [12 13]]
[[2 3]
 [6 7]]
[[10 11]
 [14 15]]

代替2，用len(xs) // 2 。

文章来源: how to split matrix into 4 quadrants in python using numpy