Re: [Gretl-devel] eigsolve

On 11/07/2011 09:58 PM, Andreas Noack Jensen wrote: > Den 07/11/2011 kl. 21.35 skrev Riccardo (Jack) Lucchetti: > >> On Mon, 7 Nov 2011, Allin Cottrell wrote: >> >>> On Mon, 7 Nov 2011, Andreas Noack Jensen wrote: >>> >>>> When talking about eigsolve it would nice if the Command >>>> Reference indicated in which order the values and vectors are >>>> sorted. >>> >>> Yes, granted. At present they're sorted from smallest to largest, >>> which is the way lapack's dsyev gives them. But while we're >>> thinking about this, is there a case for reversing the order? >>> It's more convenient to have them in descending order for >>> cointegration analysis but of course there are other uses for >>> eigen-calculations... >> >> (Badly impersonating Sven:) But that would be >> backward-incompatible, wouldn't it? >> >> No, seriously. IMO, once we've made it clear what the function's >> behaviour is, we're ok. > > > As a new user I have no idea about how much code there would be > affected, but the fact that it has not been documented so far makes > it easier to change, I believe. Right now I am reversing the order > each time I use these functions so it would be easier for me if was > changed but on the other hand it is quite easy to do it. Just for > comparison with the other players, R and Ox have descending, Matlab > one function for each direction of ordering. >