Cutting a Matrix Into a Triangle

Hey guys,

I know MATLAB has the triu and and tril functions that cut the upper and lower triangular portion of a matrix. The cut is made from the top left corner of the matrix to the bottom right corner of the matrix, like this image.

I have a 78x125 matrix and was wondering if there was a way to cut it from the top right corner to the bottom left corner?

Thanks,

Pranav Murali

Answer 1

[Rik]

Use fliplr to mirror the matrix, then use tril or triu, then mirror again with fliplr.