Thanks for commenting -- I've had that feeling too, of frustration on struggling with some wodge of formulas bedecked with indices and weighted with implicit as

Thanks for commenting -- I've had that feeling too, of frustration on struggling with some wodge of formulas bedecked with indices and weighted with implicit assumptions of unclear scope. Modern programming languages can usually express these things about as concisely, with the great advantage that you can engage with the code and it'll push back. You wonder "why isn't it this way?" and just try it.