Where is the documentation for the "end" keyword in Octave? (for indexing)

Question

I was trying to figure out what the following Octave code does:

degree = 6;
out = ones(size(X1(:,1)));
   for i = 1:degree
    for j = 0:i
        out(:, end+1) = (X1.^(i-j)).*(X2.^j);
    end
end

I wasn't sure what the end+1 meant in Octave until I found the answer for Matlab here: What is the `end+1` line doing here? The accepted answer links to the Matlab official documentation which is very clear: https://www.mathworks.com/help/matlab/ref/end.html

I'm trying to find the documentation for this same keyword in the Octave documentation but I can't seem to find it. I've searched in the Documentation tab (Octave 5.1.0), using the function index and the search tab to no avail although I see it used in several documentation pages.

Answer 1

The Octave documentation, which seems to be categorized more by usage than keyword, on Index Expressions is also as explicit:

In index expressions the keyword end automatically refers to the last entry for a particular dimension. This magic index can also be used in ranges and typically eliminates the needs to call size or length to gather array bounds before indexing.