Hi, I need to make an nxn square matrix using Latex with 1's starting in the bottom left (n,1) all the way up to the top right (1,n) on that sort of opposite diagonal. I can't figure out to do it. Also, maybe I'm wrong, but I didn't think there was a way to do diagonal dots that go the opposite way of ddots. Ideally, I would like to place ones in row n, column 1 and then row 1, column n, with a kind of reverse diagonal dots in between, and no other elements anywhere else. I cannot figure out how to do this for the life of me. Can anyone help? Thank you.