That is a great example. Some code just absolutely needs extra documentation around it. IMO, this is mostly true with more complicated or non-obvious algorithms

That is a great example. Some code just absolutely needs extra documentation around it. IMO, this is mostly true with more complicated or non-obvious algorithms like your example. There aren't really much more intelligible names you can give those variables; the algorithm just needs them. Still, I find that with 90% of the code I write for work, it's not so difficult to come up with variable and method names that make it pretty clear what's going on. I take the approach that I'll add comments anywhere I think that naming might not be enough, but that very rarely happens. Granted, I'm not writing low-level, math heavy code. I think it really just depends.