Background

It would be quite useful to have real (e^(- deadtime * s)) deadtime in transfer functions. When multiple operations are performed on them, (decoupling methods for mimo systems, multiloop control tunning strategies like BLT, etc.), pade's approximation doesn't quite cut it (the orders grow too much and the computation comes out imprecise).

Proposal

I would like to try adding this feature for the tf and most of it's methods. Of course, keeping retro-compatibility.

I wonder if prior approaches have been done in order to address this problem, and if there is a big roadblock in sight. That would be nice to know.