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Python – Add custom dimension in Matrix
  • Last Updated : 30 Dec, 2020

Sometimes, while working with Python Matrix, we can have a problem in which we need to add another dimension of custom values, this kind of problem can have problem in all kinds of domains such as day-day programming and competitive programming. Let’s discuss certain ways in which this task can be performed.

Input :
test_list = [(5, 6, 7, 8)]
vals = [10]
Output : [(5, 6, 7, 8, 10)]

Input :
test_list = [(5, ), (6, ), (7, ), (8, )]
vals = [10, 9, 8, 7]
Output : [(5, 10), (6, 9), (7, 8), (8, 7)]

Method #1 : Using zip() + list comprehension + “+” operator
The combination of above functions can be used to solve this problem. In this, we use + operator to add an element and zip() is used to extend this logic to every row of Matrix.

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# Python3 code to demonstrate working of 
# Add custom dimension in Matrix
# Using zip() + list comprehension + "+" operator
  
# initializing list
test_list = [(5, 6), (1, 2), (7, 8), (9, 12)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing Column values 
vals = [4, 5, 7, 3]
  
# Add custom dimension in Matrix
# Using zip() + list comprehension + "+" operator
res = [i + (j, ) for i, j in zip(test_list, vals)]
  
# printing result 
print("The result after adding dimension : " + str(res)) 

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Output :



The original list is : [(5, 6), (1, 2), (7, 8), (9, 12)]
The result after adding dimension : [(5, 6, 4), (1, 2, 5), (7, 8, 7), (9, 12, 3)]

 

Method #2 : Using zip() + * operator
The combination of above functions can be used to solve this problem. In this, we perform the task of joinig using unpacking operator to unpack values and then perform the join of custom values.

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# Python3 code to demonstrate working of 
# Add custom dimension in Matrix
# Using zip() + * operator
  
# initializing list
test_list = [(5, 6), (1, 2), (7, 8), (9, 12)]
  
# printing original list
print("The original list is : " + str(test_list))
  
# initializing Column values 
vals = [4, 5, 7, 3]
  
# Add custom dimension in Matrix
# Using zip() + * operator
res = [(*i, j) for i, j in zip(test_list, vals)]
  
# printing result 
print("The result after adding dimension : " + str(res)) 

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Output :

The original list is : [(5, 6), (1, 2), (7, 8), (9, 12)]
The result after adding dimension : [(5, 6, 4), (1, 2, 5), (7, 8, 7), (9, 12, 3)]

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