Re: [Gretl-devel] inconsistent (incoherent) irf function

Hi, the irf() function is a weird thing in the sense that it is the only (?) function that requires input beyond its specified arguments. Namely the information from the previous VAR/VECM estimation. From a programming-language systematic point of view it seems to be the "odd man out". In contrast, the analogous FEVD calculations are not wrapped in a function, but in the $fevd accessor, which makes more sense IMO. So I suggest to introduce a matching $irf accessor with the same layout as the $fevd accessor. I am aware that the irf() function also needs an alpha input; this could be done via "set irf_alpha 0.1" or something like that. Alternatively, the irf() function could get a new bundle argument which would collect the VAR/VECM results. That way, no dependency on non-argument input would be required, making the use consistent with all other functions.