> It's one of those things that's hard to describe because it doesn't sound like much if you got it. And this example is trivial, especially if you're not open to the idea its a problem (r/c = rows/columns) But it's nigh-impenetrable in other scenarios.

I agree, it's highly context-specific.

In a small demo for a small blog post with basically no complexity? Go ahead, use 1 character variable names, it really isn't difficult.

In the 1000 long CUDA kernel where you barely understand what's going on even though you understand the concepts? I'd be favoring longer descriptive names than one letter names for sure.