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What does Sel do in this code?

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Hey all, I am a chemical engineering student researching how to model a distillation column. I have a found a code that does this, but I'm not sure what's happening in it.
[t,x]=ode15s('cola_lv',[0 20000],0.5*ones(1,82)');
Xinit = x(sel(size(x),1,1),:)';
I understand everything here except this "sel" command. I've never heard of it in during my studies. What exactly is it doing? I also cannot seem to use this command in my version of Matlab (2020b). Is this a package command, and if so, where do I go to download it?

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KSSV on 27 Oct 2020
From where you got this code?

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Accepted Answer

Walter Roberson
Walter Roberson on 27 Oct 2020
Very old MATLAB!
It looks to me as if is just doing indexing. I think it is equivalent of
Xinit = x(end,:).';


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