Python| SymPy Permutation.inversion_vector()

Permutation.inversion_vector() : inversion_vector()是一个 sympy Python库函数，它返回参数中排列的 inversion_vector 值。
反演向量包括其值指示编号的那些元素。排列中的元素 < it 并且位于其右侧。

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

Return :
inversion_vector value of the permutation

代码 #1：inversion_vector() 示例

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

输出 ：

Permutation a – inversion_vector form : [2, 2, 0]
Permutation b – inversion_vector form : [1, 2, 3, 2, 1]

代码 #2：inversion_vector() 示例– 2D 排列

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

输出 ：

Permutation a – inversion_vector form : [3, 2, 2, 2, 0, 1]