Python Sympy Permutation.inversions()用法及代碼示例

排列.inversions()：inversions()是一個sympy Python庫函數，它返回參數中排列的取反值的數量。
反轉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

代碼＃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())

輸出：

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

代碼＃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())

輸出：

Permutation a - inversions form: 10

相關用法

注：本文由純淨天空篩選整理自noobestars101大神的英文原創作品 SymPy | Permutation.inversions() in Python。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。