Python 中的 SymPy | arrangement.unlank_lex()
原文:https://www.geesforgeks.org/sympy-置换-unlank_lex-in-python/
arrangement.unlank_lex():unlank_lex()是一个 sympy Python 库函数，返回字典排列 unranking。
语法:sympy.combinations.arranges.arrangement.unlank_lex()
返回:字典排列解开
代码# 1:unlank_lex()示例
# Python code explaining
# SymPy.Permutation.unrank_lex()
# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation
# Using from sympy.combinatorics.permutations.Permutation.unrank_lex() method
# creating Permutation
a = Permutation([[2, 0], [3, 1]])
b = Permutation([1, 3, 5, 4, 2, 0])
size = 2
rank = 5
print ("Permutation a - unrank_lex form : ", a.unrank_lex(size, rank))
print ("Permutation b - unrank_lex form : ", b.unrank_lex(size, 2))
输出:
排列 a–unlank_lex 形式:(0 1) 排列 b–unlank_lex 形式:(1)
代码# 2:unlank_lex()示例
# Python code explaining
# SymPy.Permutation.unrank_lex()
# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation
# Using from
# sympy.combinatorics.permutations.Permutation.unrank_lex() method
# creating Permutation
a = Permutation([[2, 4, 0],
[3, 1, 2],
[1, 5, 6]])
print ("Permutation a - unrank_lex form : ", a.unrank_lex(5, 2))
输出:
排列 a–unlank_lex 形式:(4)(2 3)
