我有一个numpy的阵列数据:numpy整形如何工作?
a = np.arange(100)
a = a.reshape((20,5))
当I型
a[:10]
它返回
array([[ 0, 1, 2, 3, 4],
[ 5, 6, 7, 8, 9],
[10, 11, 12, 13, 14],
[15, 16, 17, 18, 19],
[20, 21, 22, 23, 24],
[25, 26, 27, 28, 29],
[30, 31, 32, 33, 34],
[35, 36, 37, 38, 39],
[40, 41, 42, 43, 44],
[45, 46, 47, 48, 49]])
现在我决定重塑数组3D阵列。
b = a.reshape((5,4,5))
array([[[ 0, 1, 2, 3, 4],
[ 5, 6, 7, 8, 9],
[10, 11, 12, 13, 14],
[15, 16, 17, 18, 19]],
[[20, 21, 22, 23, 24],
[25, 26, 27, 28, 29],
[30, 31, 32, 33, 34],
[35, 36, 37, 38, 39]],
[[40, 41, 42, 43, 44],
[45, 46, 47, 48, 49],
[50, 51, 52, 53, 54],
[55, 56, 57, 58, 59]],
[[60, 61, 62, 63, 64],
[65, 66, 67, 68, 69],
[70, 71, 72, 73, 74],
[75, 76, 77, 78, 79]],
[[80, 81, 82, 83, 84],
[85, 86, 87, 88, 89],
[90, 91, 92, 93, 94],
[95, 96, 97, 98, 99]]])
如何切片b我得到的值如[:10]? 我试过
b[:10,0,:5]
array([[ 0, 1, 2, 3, 4],
[10, 11, 12, 13, 14],
[20, 21, 22, 23, 24],
[30, 31, 32, 33, 34],
[40, 41, 42, 43, 44],
[50, 51, 52, 53, 54],
[60, 61, 62, 63, 64],
[70, 71, 72, 73, 74],
[80, 81, 82, 83, 84],
[90, 91, 92, 93, 94]])
但它不正确。 提前谢谢!
你想要一个矩阵,10行,数字从0到50?但这就是重塑... b.reshape((20,5))[:10] – 2015-04-02 14:10:06
你确定'b'看起来像这样吗?我得到了不同的东西......我认为你有'b = a.reshape(10,2,5)' – plonser 2015-04-02 14:10:07
'b'看起来像一个'(10,2,5)'重塑 – hpaulj 2015-04-02 14:16:48