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Python – Convert Matrix to overlapping Tuple Pairs

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  • Last Updated : 10 Jul, 2020
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Sometimes, while working with Python data, we can have a problem in which we need to perform overlap of elements in Matrix, and convert them as tuple pairs. This kind of problem can occur in various application in data domain. Let’s discuss certain ways in which this task can be performed.

Input : test_list = [[5, 6, 3], [8, 6, 2], [2, 5, 1]]
Output : [(5, 6), (6, 3), (8, 6), (6, 2), (2, 5), (5, 1)]

Input : test_list = [[5, 6, 3]]
Output : [(5, 6), (6, 3)]

Method #1 : Using loop
This is brute force way in which this task can be performed. In this, we iterate each list and extract consecutive elements and add them as pair in result list.




# Python3 code to demonstrate working of 
# Convert Matrix to overlapping Tuple Pairs
# Using loop
  
# initializing list
test_list = [[5, 6, 7], [8, 6, 5], [2, 5, 7]]
  
# printing original list
print("The original list is : " + str(test_list))
  
# Convert Matrix to overlapping Tuple Pairs
# Using loop
res = []
for sub in test_list:
  res.append((sub[0], sub[1]))
  res.append((sub[1], sub[2]))
    
# printing result 
print("Filtered tuples : " + str(res)) 

Output :

The original list is : [[5, 6, 7], [8, 6, 5], [2, 5, 7]]
Filtered tuples : [(5, 6), (6, 7), (8, 6), (6, 5), (2, 5), (5, 7)]

 

Method #2 : Using loop + list slicing
The combination of above functionalities can be used to solve this problem. This offers flexibility to extend logic to more custom tuple sizes, more than 2 as well.




# Python3 code to demonstrate working of 
# Convert Matrix to overlapping Tuple Pairs
# Using loop + list slicing
  
# initializing list
test_list = [[5, 6, 7], [8, 6, 5], [2, 5, 7]]
  
# printing original list
print("The original list is : " + str(test_list))
  
# Convert Matrix to overlapping Tuple Pairs
# Using loop + list slicing
res = []
for sub in test_list:
    for idx in range(len(sub) -1):
        res.append(tuple(sub[idx:idx + 2]))
    
# printing result 
print("Filtered tuples : " + str(res)) 

Output :

The original list is : [[5, 6, 7], [8, 6, 5], [2, 5, 7]]
Filtered tuples : [(5, 6), (6, 7), (8, 6), (6, 5), (2, 5), (5, 7)]

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