Python | SymPy placement.get_preference_distance()方法
原文:https://www.geesforgeks.org/python-sympy-置换-get_preference_distance-method/
arrangement.get_preference_distance():get_preference_distance()是一个 sympy Python 库函数，计算两个排列之间的优先距离。
p 和 q 代表 n 个作业。优先度量计算在 p 和 q 中作业 n 前面有作业 m 的次数。这是一个交换矩阵。
语法: sympy.combinations .排列.置换._precedence_distance()
返回: 两个排列之间的优先距离
代码# 1:get_preference_distance()示例
# Python code explaining
# SymPy.Permutation.get_precedence_distance()
# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation
# Using from
# sympy.combinatorics.permutations.Permutation.get_precedence_distance() method
# creating Permutation
a = Permutation([2, 0, 3, 1, 5, 4])
b = Permutation([3, 1, 2, 5, 4, 0])
c = Permutation([0, 1, 3, 4, 5, 2])
print ("a - get_precedence_distance form b: ", a.get_precedence_distance(b))
print ("b - get_precedence_distance form c: ", b.get_precedence_distance(c))
输出:
a–get_preference_distance 表格 b:6 b–get_preference_distance 表格 c: 9
代码# 2:get_preference_distance()示例–2D 置换
# Python code explaining
# SymPy.Permutation.get_precedence_distance()
# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation
# Using from
# sympy.combinatorics.permutations.Permutation.get_precedence_distance() method
# creating Permutation
a = Permutation([[2, 4, 0],
[7, 1, 3],
[8, 5, 6]])
b = Permutation([[8, 4, 0],
[2, 7, 0],
[1, 6, 7]])
print ("a get_precedence_distance form b : ", a.get_precedence_distance(b))
输出:
a get_precedence_distance 表格 b : 22
