Open In App
Related Articles

Python | SymPy Permutation.index() method

Improve
Improve
Improve
Like Article
Like
Save Article
Save
Report issue
Report
Permutation.index() : index() is a sympy Python library function that returns the index value of the permutation in argument. Index of a permutation = Sum of all subscripts j such that permutation[j] is greater than permutation[j+1].
Syntax : sympy.combinatorics.permutations.Permutation.index() Return : index value of the permutation
Code #1 : index() Example
# 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())

                    
Output :
Permutation a – index form : 1 Permutation b – index form : 9
Code #2 : index() Example – 2D Permutation
# 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())

                    
Output :
Permutation a – index form : 8


Last Updated : 27 Aug, 2019
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads