flatten()函数的用法 使数组或者矩阵变成一维
用在数组
python">import numpy as np
a = [[1,3],[2,4],[3,5]]
a = np.array(a)
b = a.flatten()
print(a)
print(b)输出:
[[1 3][2 4][3 5]]
[1 3 2 4 3 5]Process finished with exit code 0
用在列表(不可以直接用在列表)
直接用会报错
import numpy as np
a = [[1,3],[2,4],[3,5]]
b = flatten(a)
print(a)
print(b)报错
用在矩阵:
import numpy as np
a = [[1,3],[2,4],[3,5]]
a = np.mat(a)
b = a.flatten()#矩阵
c = b.A#数组
print(a)
print(b)
print(c)输出:
[[1 3][2 4][3 5]]
[[1 3 2 4 3 5]]
[[1 3 2 4 3 5]]Process finished with exit code 0
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