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.
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?