I have an empty matrix:
I would like to fill the diagonal of a matrix with zeros:
Is there any clever way to do it?
The matrix can be pretty large and it's tedious to do this manually. I could use some AutoHotkey scripts but I wonder whether there is some better way. I am aware of the question How can I dynamically format the diagonal cells in Google Spreadsheet? but I want out whether filling the diagonal with zeros can be done without scripting.