[Solved] Inplace rotation of a matrix

by


Always use numpy for matrix operations. I’ll assume an m*n numpy array arr. I first did a transpose using the np.transpose function and then I flipped it using the np.fliplr function.

output = np.fliplr(np.transpose(arr))

As mentioned in the comments, there is no way to do an in-place replace without a temporary variable for rectangular matrices. It’s better to simulate the behavior (if storage is your concern) using a function like this,

def clockwise(matrix, row, column):
    return matrix[-(column + 1)][row]

2

solved Inplace rotation of a matrix