Permutation.index():index()是一个sympy Python库函数,它返回参数中置换的索引值。
置换的索引=所有下标j的总和,以使置换[j]大于置换[j + 1]。
用法:
sympy.combinatorics.permutations.Permutation.index()
返回:
排列的索引值
代码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())输出:
Permutation a – index form : 1
Permutation b – index form : 9
代码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())输出:
Permutation a – index form : 8
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