Python Program to Transpose a Matrix

Tutorialsrack 23/04/2020 Python

In this Python program to transpose a matrix. Transpose of a matrix is the interchanging of rows and columns. In other words, Transpose of a matrix means converting rows into columns and columns into rows.  It is denoted as “X” matrix. The element at i^th row and jth column in X will be placed at j^th row and ith column in “X”. So if X is a 3x2 matrix, “X” will be a 2x3 matrix.

Here is the code of the program to transpose a matrix.

Program 1: Program to transpose a matrix using a nested loop

# Program to transpose a matrix using a nested loop

# 2x3 Matrix
X = [[6,7],
    [4 ,5],
    [3 ,8]]

# Output matrix is 3x2
result = [[0,0,0],
         [0,0,0]]

# iterate through rows
for i in range(len(X)):
   # iterate through columns
   for j in range(len(X[0])):
       result[j][i] = X[i][j]

print("\nOutput after Transpose Matrix")
for r in result:
   print(r)

Program 2: Program to transpose a matrix using list comprehension

# Program to transpose a matrix using list comprehension

# 2x3 Matrix
X = [[6,7],
    [4 ,5],
    [3 ,8]]

result = [[X[j][i] for j in range(len(X))] for i in range(len(X[0]))]

print("\nOutput after Transpose Matrix")
for r in result:
   print(r)

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