numpy学习专题
十四、numpy分割数组
分割数组
split()
原型：numpy.split(array,indices_or_setctions,axis=0)
作用：函数沿特定的轴将数组分割为子数组
参数 说明
array 被分割的数组
indices_or_sections 是一个整数，就用该数平均切分，如果是一个数组，为沿轴切分的位置（左开右闭）
axis 沿着那个维度进行切向，默认为0，横向切分，为1时，纵向切分
import numpy as np
arr = np.arange(1,9).reshape(4,2)
print(arr,"\n")
print(np.split(arr,2),"\n")
print(np.split(arr,4),"\n")
print(np.split(arr,2,1),"\n")
print(np.split(arr,[1,2]),"\n")
arr2 = np.arange(1,10)
print(np.split(arr2,[3,8]))
[[1 2]
[3 4]
[5 6]
[7 8]]
[array([[1, 2],
[3, 4]]), array([[5, 6],
[7, 8]])]
[array([[1, 2]]), array([[3, 4]]), array([[5, 6]]), array([[7, 8]])]
[array([[1],
[3],
[5],
[7]]), array([[2],
[4],
[6],
[8]])]
[array([[1, 2]]), array([[3, 4]]), array([[5, 6],
[7, 8]])]
[array([1, 2, 3]), array([4, 5, 6, 7, 8]), array([9])]
hsplit()
用于竖直分割数组，通过指定返回相同形状的数组数量来拆分原数组
import numpy as np
arr = np.arange(1,9).reshape(2,4)
print(arr,"\n")
print(np.hsplit(arr,4),"\n")
print(np.hsplit(arr,2),"\n")
[[1 2 3 4]
[5 6 7 8]]
[array([[1],
[5]]), array([[2],
[6]]), array([[3],
[7]]), array([[4],
[8]])]
[array([[1, 2],
[5, 6]]), array([[3, 4],
[7, 8]])]
vsplit()
用于竖直分割数组，通过指定返回相同形状的数组数量来拆分原数组
import numpy as np
arr = np.arange(1,9).reshape(4,2)
print(arr,"\n")
print(np.vsplit(arr,4),"\n")
print(np.vsplit(arr,2),"\n")
[[1 2]
[3 4]
[5 6]
[7 8]]
[array([[1, 2]]), array([[3, 4]]), array([[5, 6]]), array([[7, 8]])]
[array([[1, 2],
[3, 4]]), array([[5, 6],
[7, 8]])]
一定要支持作者哦
