SymPy | Permutation.is_even() in Python
Last Updated :
26 Aug, 2019
Permutation.is_even() : is_even() is a sympy Python library function that checks whether the permutation is even.
Syntax : sympy.combinatorics.permutations.Permutation.is_even()
Return : true – if the permutation is even; otherwise false
Code #1 : is_even() Example
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation
a = Permutation([[ 2 , 0 ], [ 3 , 1 ]])
b = Permutation([ 1 , 3 , 5 , 4 , 2 , 0 ])
print ( "Permutation a - is_even form : " , a.is_even)
print ( "Permutation b - is_even form : " , b.is_even)
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Output :
Permutation a – is_even form : True
Permutation b – is_even form : False
Code #2 : is_even() Example – 2D Permutation
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation
a = Permutation([[ 2 , 4 , 0 ],
[ 3 , 1 , 2 ],
[ 1 , 5 , 6 ]])
print ( "Permutation a - is_even form : " , a.is_even)
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Output :
Permutation a – is_even form : True
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