笛卡尔乘积是指在数学中,两个集合X和Y的笛卡尔积(Cartesian product),又称直积,表示为X × Y,第一个对象是X的成员而第二个对象是Y的所有可能有序对的其中一个成员.
#!/usr/bin/python3 # -*- coding: utf-8 -*- # @version: 1.0 # @desc : 用python实现求笛卡尔积 import itertools class cartesian(object): def __init__(self): self._data_list=[] def add_data(self,data=[]): #添加生成笛卡尔积的数据列表 self._data_list.append(data) def build(self): #计算笛卡尔积 for item in itertools.product(*self._data_list): print(item) if __name__=="__main__": car=cartesian() car.add_data([1,2,3,4]) car.add_data([5,6,7,8]) car.add_data([9,10,11,12]) car.build()
计算的结果如下:
(1, 5, 9) (1, 5, 10) (1, 5, 11) (1, 5, 12) (1, 6, 9) (1, 6, 10) (1, 6, 11) (1, 6, 12) (1, 7, 9) (1, 7, 10) (1, 7, 11) (1, 7, 12) (1, 8, 9) (1, 8, 10) (1, 8, 11) (1, 8, 12) (2, 5, 9) (2, 5, 10) (2, 5, 11) (2, 5, 12) (2, 6, 9) (2, 6, 10) (2, 6, 11) (2, 6, 12) (2, 7, 9) (2, 7, 10) (2, 7, 11) (2, 7, 12) (2, 8, 9) (2, 8, 10) (2, 8, 11) (2, 8, 12) (3, 5, 9) (3, 5, 10) (3, 5, 11) (3, 5, 12) (3, 6, 9) (3, 6, 10) (3, 6, 11) (3, 6, 12) (3, 7, 9) (3, 7, 10) (3, 7, 11) (3, 7, 12) (3, 8, 9) (3, 8, 10) (3, 8, 11) (3, 8, 12) (4, 5, 9) (4, 5, 10) (4, 5, 11) (4, 5, 12) (4, 6, 9) (4, 6, 10) (4, 6, 11) (4, 6, 12) (4, 7, 9) (4, 7, 10) (4, 7, 11) (4, 7, 12) (4, 8, 9) (4, 8, 10) (4, 8, 11) (4, 8, 12)
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