Re: [Gretl-devel] RFC: time-series filter (long, I'm afraid)

This is, in some contexts, rather unsatisfactory. However, I see no easy way out. Ideally, one should be able to indicate what pre-sample values for x and y should be. I'm a bit wary of adding 2 extra parameter to a function, so we mat want to turn this functionality into a command, something like filter x A C ; y0 x0 and receive output via some dollar accessor. But OTOH it's nice from a programming viewpoint to use all the genr infrastructure. Another issue is computational: there may be some advantage in using Fourier transforms for this. However, I'm no expert here and if any of you can give me any hint of the pros and cons, I'd be most grateful. Your opinions? (Sorry for the long message)