Python Sympy Permutation.unrank_lex()用法及代码示例

Permutation.unrank_lex()：unrank_lex()是一个sympy Python库函数，它返回词法排列不排序。

用法： sympy.combinatorics.permutations.Permutation.unrank_lex()

返回：词典排列置换

代码1：unrank_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：

Permutation a – unrank_lex form : (0 1)
Permutation b – unrank_lex form : (1)

代码2：unrank_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：

Permutation a – unrank_lex form : (4)(2 3)

相关用法

注：本文由纯净天空筛选整理自noobestars101大神的英文原创作品 SymPy | Permutation.unrank_lex() in Python。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。