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Python SymPy Permutation.index()用法及代码示例


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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注:本文由纯净天空筛选整理自noobestars101大神的英文原创作品 Python | SymPy Permutation.index() method。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。