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

排列.inversions()：inversions()是一个sympy Python库函数，它返回参数中排列的取反值的数量。
反转向量包括其值表示否的那些元素。排列中的元素是

用法：Return: number of inversions value of the permutation in argument

代码＃1：inversions()示例

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

输出：

Permutation a - inversions form: 4
Permutation b - inversions form: 9

代码＃2：inversions()示例-2D排列

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

输出：

Permutation a - inversions form: 10

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.inversions() 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。