When looking for snippets of code for MATLAB and Octave I noticed that functions are ended in various ways, and all of them seem to work just fine. To be specific, I am talking about functions residing in their specific file.

MATLAB seems to end their functions with end.

function y = average(x)
  y = sum(x)/length(x); 
end

Octave ends its functions with endfunction.

function retval = avg (v)
  retval = sum (v) / length (v);
endfunction

However, my functions work perfectly fine without any keyword at the end of the function.

So my question is, how strict are MATLAB/Octave with the endings of function definitions.