On Mon, 27 Feb 2006, Arnaud Bervas wrote:
 By chance, would there be anyone having developed a Kalman 
 filtering program with Gretl ? I imagine that such a program might 
 be developed with Gretl and I would be interested in having a look 
 at an example. 
There have been some requests/suggestions/questions regarding this 
in the past.
To my knowledge, nobody has done anything along these lines yet, 
although as Jack has said, the new matrix manipulation facility in 
(not-yet-released) gretl 1.5.1 makes this possible, if not exactly 
easy.
I've recently got interested in the subject, partly because it seems 
to offer a systematic way of offering Exact Maximum Likelihood 
estimation of ARIMA models within gretl.  It's possible we'll add 
the Kalman filter before too long, but probably not in the next 
(overdue!) release.
Allin Cottrell