Try this (remember that the first row or column is index 0, so modify as needed if you want to start with one.)
Image may be NSFW.
Clik here to view.
(The function is "replace array subset")
Try this (remember that the first row or column is index 0, so modify as needed if you want to start with one.)
Image may be NSFW.
Clik here to view.
(The function is "replace array subset")