Python - Vertical Concatenation in Matrix

Introduction:

In this tutorial, we are learning about Python - Vertical Concatenation in Matrix. It takes input as a Matrix form, which can perform string concatenation column-wise. It also handles the list variable's length. You can use list comprehension when you want to combine matrices vertically.

Example:

Now, we gave some examples of Vertical Concatenation in Matrix.

Input: [["Hello"], ["good"]], ["morning"]]
Output: ['Hellogoodmorning'] 
Explanation: The given input string matrix was concatenated by Column wise. Here, "Hello" is concatenated with "good" and "morning". 

Input: [["Hello", "everyone"], ["good", "morning"]] 
Output: ['Hellogood', 'everyonemorning'] 
Explanation: The given input string matrix was concatenated by Column wise. Here "Hello" is concatenated with "good", and "everyone" is concatenated with "morning". 

Input: [["Hello", "every", "one"], ["very", "good", "morning"]] 
Output: ['Hellovery', 'everygood', "onemorning"] 
Explanation: The given input string matrix was concatenated by Column wise. Here "Hello" is concatenated with "very", "every" is concatenated with "good", and "one" is concatenated with "morning".

Give some examples of Vertical Concatenation of Matrix in Python:

Now, we give some examples of vertical concatenation of matrix in Python. The examples are given below -

Program code 1:

Here, we give an example of vertical concatenation in the matrix using loops. The code is written in Python, which is given below -

# Example of vertical concatenation in matrix using loops 
# Initialize the list of string matrix
list = [["Hello", "everyone"], ["good", "morning"], ["Kolkata"]]

# Print the list of the given string
print("The list of the string is : " + str(list))

# Use loop which performs iteration here
res = []
n = 0
while n != len(list):
    temp = ''
    for idx in list:
        
       
# Valid Column is checking here
       
try: temp = temp + idx[n]
       
except IndexError: pass
   
res.append(temp)
    n = n + 1

res = [ele for ele in res if ele]

# Print the final output of the list here
print("The list of the string after column wise Concatenation is: " + str(res))

Output:

Now we compile the above code in Python, and after successful compilation, we run it. Then the output is given below -

The list of the string is: [['Hello', 'everyone'], ['good', 'morning'], ['Kolkata']]
The list of the string after column wise Concatenation is: ['HellogoodKolkata', 'everyonemorning']

Program code 2:

Now, we give another example of vertical concatenation in the matrix using packages. We use the zip_longest and join() function for the list's vertical concatenation. Here, we give three columns in the list, which performs column-wise concatenation. The code is written in Python, which is given below -

# Import zip_longest library here
from itertools import zip_longest

# Initialize the list of string matrix
list = [["Hello," "coders"], ["welcome", "to"], ["JavaTpoint"]]

# Print the list of the given string
print("The list of string is: ", list)

# zip_longest and join() function is used to find the result
res = ["".join(elem) for elem in zip_longest(*list, fillvalue ="")]

# Print the final output of the list here
print("The list of the string after column wise Concatenation is: ", res)

Output:

Now we compile the above code in Python, and after successful compilation, we run it. Then the output is given below -

The list of the string is: [['Hello', 'coders'], ['welcome', 'to'], ['JavaTpoint']]
The list of the string after column wise Concatenation is: ['HellowelcomeJavaTpoint', 'codersto']

Program code 3:

We give the last example of column-wise or vertical concatenation in the matrix using numpy libraries. Here, we use numpy.transpose() and numpy.ravel() function for performing the Column-wise concatenation. The code is written in Python, which is given below -

# Import numpy library
import numpy as np
 
# Initialize the list of string matrix
list = [["Hello", "coders"], ["welcome", "to"], ["JavaTpoint"]]

# Print the list of the given string
print("The list of the string is: ", list)
 
# Find the Maximum length 
maxlen = max(len(sublist) for sublist in list)
 
# Pad the sublists with empty strings to make the same length as every sublist
p_list = [sublist + [''] * (maxlen - len(sublist)) for sublist in list]
 
# Here, the list id converts into a numpy array
arr = np.array(p_list)
 
# For switching rows and columns, use transpose here 
arr_t = arr.T
 
# Used join() function for row concatenation
result = [''.join(row) for row in arr_t]
 
# Print the final output of the list here
print("The list of the string after column wise Concatenation is: ", result)

Output:

Now we compile the above code in Python, and after successful compilation, we run it. Then the output is given below -

The list of the string is: [['Hello', 'coders'], ['welcome', 'to'], ['JavaTpoint']]
The list of the string after column wise Concatenation is: ['HellowelcomeJavaTpoint', 'codersto']

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