You know, looking back at some of my attempts at using PDL, a simple tie interface wrapper that allows you to treat piddles as normal arrays would greatly reduce the gradient?

I realise that it probably wouldn't be as efficient, but it might allow an easier start and once you get stuff going, it should be fairly 'algorithmic' to convert it back to native calls to squeeze out that last ounze of performance.

Anyway, I'll keep my eyes open for the tutorials. Thanks again.