Example: Rotate Matrix 90 degrees Clockwise Python Program

# Rotate Matrix 90 degrees Clockwise Python Program

# It's the function to rotate
# the matrix 90 degree clock-wise
def rotate90DegClockwise(arru, N):
    pass

    # It will traverse the each cycle
    for i in range (int (N / 2)):
        for j in range (i, int (N - i - 1)):

            # It will swap elements of each cycle in clock-wise direction
            temp = arru[i][j]
            arru[i][j] = arru[N - 1 - j][i]
            arru[N - 1 - j][i] = arru[N - 1 - i][N - 1 - j]
            arru[N - 1 - i][N - 1 - j] = arru[j][N - 1 - i]
            arru[j][N - 1 - i] = temp


# It's the function for printing the rotated matrix
def printMatrix(arru, N):
    pass

    for i in range (N):
        print (end="\t")
        for j in range (N):
            print (arru[i][j], end="\t")
        print (end="\n\n")


# This is the driven calculation of matrix rotation
arru = [
    [13, 13, 17, 11],
    [25, 26, 27, 28],
    [39, 30, 31, 31],
    [43, 44, 45, 46]
]

# This will print the matrix before rotation
print ("-----The input matrix before 90 degrees clock-wise rotation-----\n")
printMatrix(arru, 4)

# This function will be rotate each element clock-wise
rotate90DegClockwise(arru, 4)

# This will print the matrix after rotation
print ("\n-----The matrix after 90 degrees clock-wise rotation-----\n")
printMatrix(arru, 4)