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Python | Maximize Column in Records List

  • Last Updated : 29 Dec, 2019

Sometimes, we encounter a problem where we deal with a complex type of matrix column maximization in which we are given a tuple and we need to perform the maximization of its like elements. This has a good application in Machine Learning domain. Let’s discuss certain ways in which this can be done.

Method #1 : Using zip() + list comprehension
This problem can be resolved using the list comprehension which could perform the column maximization logic and zip function is used to bind the elements as a result and also at the time of vertical maximization.

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# Python3 code to demonstrate
# Maximize Column in Records List
# using list comprehension + zip()
  
# initializing list 
test_list = [[(1, 4), (2, 3), (5, 2)], [(3, 7), (1, 9), (10, 5)]]
  
# printing original list
print("The original list : " + str(test_list))
  
# using list comprehension + zip()
# Maximize Column in Records List
res = [tuple(max(j) for j in zip(*i)) for i in zip(*test_list)]
  
# print result
print("The maximization of columns of tuple list : " + str(res))
Output :



The original list : [[(1, 4), (2, 3), (5, 2)], [(3, 7), (1, 9), (10, 5)]]
The maximization of columns of tuple list : [(3, 7), (2, 9), (10, 5)]

 

Method #2 : Using zip() + map()
The task of binding the column elements can also be performed using the map function and the zip function performs the task of binding the maximized tuples. Both logics bound by list comprehension.




# Python3 code to demonstrate
# Maximize Column in Records List
# using zip() + map()
  
# initializing list 
test_list = [[(1, 4), (2, 3), (5, 2)], [(3, 7), (1, 9), (10, 5)]]
  
# printing original list
print("The original list : " + str(test_list))
  
# using zip() + map()
# Maximize Column in Records List
res = [tuple(map(max, zip(*i))) for i in zip(*test_list)]
  
# print result
print("The maximization of columns of tuple list : " + str(res))
Output :
The original list : [[(1, 4), (2, 3), (5, 2)], [(3, 7), (1, 9), (10, 5)]]
The maximization of columns of tuple list : [(3, 7), (2, 9), (10, 5)]



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