numpy.reshape
2016-03-04 16:00
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numpy.reshape(a, newshape, order=’C’)
官方解释:Gives a new shape to an array without changing its data.
看几个例子
arr为:
[[[[ 0, 1, 2],
[ 3, 4, 5],
[ 6, 7, 8],
[ 9, 10, 11],
[ 12, 13, 14]],
arr_r为:
[[[[ 0, 1, 2, 3, 4],
[ 5, 6, 7, 8, 9],
[ 10, 11, 12, 13, 14]],
可见在跑一趟好哦你中,具有和C++一样的RowMajor性质。
注意arr.transpose()与arr.reshape()的不同:transpose只是转动一下坐标轴,每个轴多长并不变,只是换了个方向;而reshape()会将元素以RowMajor准则对元素进行重新排列。
官方解释:Gives a new shape to an array without changing its data.
看几个例子
[code]l=range(120) import numpy as np arr=np.array(l) arr=arr.reshape(2,4,5,3)
arr为:
[[[[ 0, 1, 2],
[ 3, 4, 5],
[ 6, 7, 8],
[ 9, 10, 11],
[ 12, 13, 14]],
[code] [[ 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, 100, 101], [102, 103, 104]], [[105, 106, 107], [108, 109, 110], [111, 112, 113], [114, 115, 116], [117, 118, 119]]]]
[code]arr_r = arr.reshape(2,4,3,5)
arr_r为:
[[[[ 0, 1, 2, 3, 4],
[ 5, 6, 7, 8, 9],
[ 10, 11, 12, 13, 14]],
[code] [[ 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], [100, 101, 102, 103, 104]], [[105, 106, 107, 108, 109], [110, 111, 112, 113, 114], [115, 116, 117, 118, 119]]]]
可见在跑一趟好哦你中,具有和C++一样的RowMajor性质。
注意arr.transpose()与arr.reshape()的不同:transpose只是转动一下坐标轴,每个轴多长并不变,只是换了个方向;而reshape()会将元素以RowMajor准则对元素进行重新排列。
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