Python SymPy Permutation.index()用法及代碼示例

Permutation.index()：index()是一個sympy Python庫函數，它返回參數中置換的索引值。

置換的索引=所有下標j的總和，以使置換[j]大於置換[j + 1]。

用法：

sympy.combinatorics.permutations.Permutation.index()

返回：
排列的索引值

代碼1：index()示例

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

輸出：

Permutation a – index form : 1
Permutation b – index form : 9

代碼2：index()示例– 2D排列

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

輸出：

Permutation a – index form : 8

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