Python | Column summation of tuples

Sometimes, we encounter a problem where we deal with a complex type of matrix column summation in which we are given a tuple and we need to perform the summation 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 summation logic and zip function is used to bind the elements as a result and also at the time of vertical summation.

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# Python3 code to demonstrate
# column summation of list of tuple
# 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()
# columnn summation of list of tuple
res = [tuple(sum(j) for j in zip(*i))
            for i in zip(*test_list)]
  
# print result
print("The summation of columns of tuple list : " + str(res))

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Output :

The original list : [[(1, 4), (2, 3), (5, 2)], [(3, 7), (1, 9), (10, 5)]]
The summation of columns of tuple list : [(4, 11), (3, 12), (15, 7)]

 

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 summation tuples. Both logics bound by list comprehension.

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# Python3 code to demonstrate
# column summation of list of tuple
# 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()
# columnn summation of list of tuple
res = [tuple(map(sum, zip(*i))) 
      for i in zip(*test_list)]
  
# print result
print("The summation of columns of tuple list : " + str(res))

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Output :

The original list : [[(1, 4), (2, 3), (5, 2)], [(3, 7), (1, 9), (10, 5)]]
The summation of columns of tuple list : [(4, 11), (3, 12), (15, 7)]


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