Ben is studying matrices and wants to write a program that swaps two rows of a matrix (N, M), the program takes an input matrix, swaps the specified rows, and then displays the modified matrix.Assist him with the program.Input format :The first line consists of two space-separated integers N and M, representing the number of rows and columns in the matrix.The next N lines contain M space-separated integers each, representing the elements of the matrix.The last line consists of two space-separated integers r1 and r2, representing the row numbers to be interchanged.Output format :If the input row numbers r1 or r2 are invalid (less than 1 or greater than the number of rows), the output prints "Invalid row numbers".Otherwise, the modified matrix is printed after swapping the specified rows.
Question
Ben is studying matrices and wants to write a program that swaps two rows of a matrix (N, M), the program takes an input matrix, swaps the specified rows, and then displays the modified matrix.Assist him with the program.Input format :The first line consists of two space-separated integers N and M, representing the number of rows and columns in the matrix.The next N lines contain M space-separated integers each, representing the elements of the matrix.The last line consists of two space-separated integers r1 and r2, representing the row numbers to be interchanged.Output format :If the input row numbers r1 or r2 are invalid (less than 1 or greater than the number of rows), the output prints "Invalid row numbers".Otherwise, the modified matrix is printed after swapping the specified rows.
Solution
Sure, here is a Python program that accomplishes the task:
def swap_rows(matrix, r1, r2):
# Check if row numbers are valid
if r1 < 1 or r1 > len(matrix) or r2 < 1 or r2 > len(matrix):
return "Invalid row numbers"
# Swap rows
matrix[r1-1], matrix[r2-1] = matrix[r2-1], matrix[r1-1]
return matrix
# Input format
N, M = map(int, input().split())
matrix = []
for _ in range(N):
row = list(map(int, input().split()))
matrix.append(row)
r1, r2 = map(int, input().split())
# Call the function and print the result
result = swap_rows(matrix, r1, r2)
if type(result) == str:
print(result)
else:
for row in result:
print(' '.join(map(str, row)))
This program first reads the number of rows and columns from the user. Then it reads each row of the matrix and the row numbers to be swapped. It calls the swap_rows function with the matrix and the row numbers. If the row numbers are invalid, the function returns a string and the program prints it. Otherwise, it prints the modified matrix.
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