Open In App

SymPy | Partition.prev_lex() in Python

Improve
Improve
Like Article
Like
Save
Share
Report

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] 
 

 



Last Updated : 12 Sep, 2023
Like Article
Save Article
Previous
Next
Share your thoughts in the comments
Similar Reads