I've google a bit about this topic but I've found no result.
I'm trying to write some notes for my University course. The topic is "numerical interpolation methods". More precisely I have to build a table of "finite differences" (here a description, about at mid page you can see a table of values which are "triangular", that's what I have to do) which is pretty easy to do with the
What I need though is to add a line that "links", say, the first cell in the first column with the second cell in the second column. How would I do that?
Here's an example, you can see lines going from one cell to another.