Python| SymPy Permutation.from_inversion_vector() 方法

Permutation.from_inversion_vector() ：from_inversion_vector()是一个 sympy Python库函数，它从反转向量返回排列。
反转向量 -排列中第 i 个元素左侧的元素数 > 第 i 个元素给出了反转向量的第 i 个元素。

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

Return :
permutation from the inversion vector

代码 #1：from_inversion_vector() 示例

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

输出 ：

vector a – from_inversion_vector form : Permutation([1, 0], size=5)
vector b – from_inversion_vector form : Permutation([6, 5, 4, 3, 0, 1, 2])

代码 #2：from_inversion_vector() 示例

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

输出 ：

vector a – from_inversion_vector form : Permutation([2, 4, 1, 0, 3])