SymPy | Partition.prev_lex() in Python
Partition.prev_lex() : prev_lex() is a sympy Python library function that returns the previous integer partition, n in lexicographical order. This ordering wraps around [n] if the partition is [1, …, 1].
Syntax : sympy.combinatorics.partitions.Partition.prev_lex()
Return : previous integer partition, n in lexicographical order
Code #1 : prev_lex() Example
Python3
] # Python code explaining # SymPy.prev_lex() # importing SymPy libraries from sympy.combinatorics.partitions import Partition from sympy.combinatorics.partitions import IntegerPartition # Using from sympy.combinatorics.partitions.Partition.prev_lex() method p = IntegerPartition([ 312 , 121 , 14 , 5 ]) print ( 'p : ' , p) print ( '\nPrevious Integer : ' , p.prev_lex()) |
Output :
p : [312, 121, 14, 5]
Previous Integer : [312, 121, 14, 4, 1]
Code #2 : prev_lex() Example
Python3
] # Python code explaining # SymPy.prev_lex() # importing SymPy libraries from sympy.combinatorics.partitions import Partition from sympy.combinatorics.partitions import IntegerPartition # Using from sympy.combinatorics.partitions.Partition.prev_lex() method p = IntegerPartition([ 1 , 312 , 121 , 14 , 34 , 56 , 32 ]) print ( 'p : ' , p) print ( '\nPrevious Integer : ' , p.prev_lex()) |
Output :
p : [312, 121, 56, 34, 32, 14, 1]
Previous Integer : [312, 121, 56, 34, 32, 13, 2]
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