Python | SymPy placement . descents()方法

原文:https://www . geesforgeks . org/python-sympy-置换-descents-method/

置换. descents() : descents() 是一个 sympy Python 库函数，返回置换中 descents 的位置。下降是 a[i] > a[i+1] 的元素

语法:sympy . combinations .排列.置换. descents()

返回:下降在排列中的位置

代码#1:下降()示例

# Python code explaining
# SymPy.descents()

# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation

# Using from sympy.combinatorics.permutations.Permutation.descents() method 

# creating Permutation
a = Permutation([[2, 0], [3, 1]])

b = Permutation([1, 3, 5, 4, 2, 0])

print ("Permutation a - descents form : ", a.descents())
print ("Permutation b - descents form : ", b.descents())

输出:

排列 a–下降形式:[1] 排列 b–下降形式:[2，3，4]

代码#2:下降()示例–2D 排列

# Python code explaining
# SymPy.descents()

# importing SymPy libraries
from sympy.combinatorics.partitions import Partition
from sympy.combinatorics.permutations import Permutation

# Using from sympy.combinatorics.permutations.Permutation.descents() method 

# creating Permutation
a = Permutation([[2, 4, 0], 
                 [3, 1, 2],
                 [1, 5, 6]])

print ("Permutation a - descents form : ", a.descents())

输出:

排列 a–下降形式:[0，3，5]

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