SymPy | Python中的 Permutation.unrank_trotterjohnson()

Permutation.unrank_trotterjohnson() ：unrank_trotterjohnson()是一个 sympy Python库函数，它返回 Trotter Johnson 排列 unranking

Syntax : sympy.combinatorics.permutations.Permutation.unrank_trotterjohnson()

Return : Trotter Johnson permutation unranking

代码 #1：unrank_trotterjohnson() 示例

# Python code explaining
# SymPy.Permutation.unrank_trotterjohnson()
  
# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation
  
# Using from sympy.combinatorics.permutations.Permutation.unrank_trotterjohnson() method 
  
# creating Permutation
a = Permutation([[2, 0], [3, 1]])
  
b = Permutation([1, 3, 5, 4, 2, 0])
  
size = 3
  
rank = 5
  
print ("Permutation a - unrank_trotterjohnson form : ", a.unrank_trotterjohnson(size, rank))
print ("Permutation b - unrank_trotterjohnson form : ", b.unrank_trotterjohnson(5, rank))

输出 ：

Permutation a – unrank_trotterjohnson form : (2)(0 1)
Permutation b – unrank_trotterjohnson form : (0 4 2 1)

代码 #2：unrank_trotterjohnson() 示例

# Python code explaining
# SymPy.Permutation.unrank_trotterjohnson()
  
# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation
  
# Using from 
# sympy.combinatorics.permutations.Permutation.unrank_trotterjohnson() method 
  
# creating Permutation
a = Permutation([[2, 4, 0], 
                 [3, 1, 2],
                 [1, 5, 6]])
  
  
print ("Permutation a - unrank_trotterjohnson form : ", a.unrank_trotterjohnson(4, 8))

输出 ：

Permutation a – unrank_trotterjohnson form : (3)(0 2 1)