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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