Hi when i tried running the code on jupyter, I am unable to obtain the
"rotated 90 degrees clockwise and scaled up 2X. However, the result is now obviously diminished as you can easily see discontinuity in the pixel intensities."

For me it shows up as a blank image.
I am using Python 3

Do you have any idea what might be the issue?
Hope to hear from you soon!

Problem:

I am trying to rotate and scale an image using the following Python code:

    """
        img = matplotlib.pyplot.imread('letterR.jpg')
        T = np.array([[0, 2, 0],
             [-2, 0, 0]
             [0, 0, 1]])
    """

img_transformed = np.empty((2000, 2000, 4), dtype=np.uint8)
for i, row in enumerate(img):
    for j, col in enumerate(row):
        pixel_data = img[i, j, :]
        input_coords = np.array([i, j, 1])
        i_out, j_out, _ = T @ input_coords
        img_transformed[i_out, j_out, :] = pixel_data

plt.figure(figsize=(5, 5))
plt.imshow(img_transformed)

letterR.jpg

However, when I execute this code, I am not getting the same output as shown in the following image:

expected output

Instead, I am getting the following output:

actual output

Error messages:

I am not receiving any error messages.

Additional information:

I have tried executing the code on different machines and I am getting the same results.

I am not sure why the code is not producing the expected output. I would appreciate any help that you can provide.

Thank you.