Thanks for the response. I downloaded the routine using the package manager and J6.02.
What I don't get is that the in the example lbfgs_test the routine is called with parameter values that do not correspond to what is stated in the provided FORTRAN description of the calling sequence. In particular and as an example, the dimension on X does not appear to be N but something much bigger. Hence the example is hard, if not impossible to follow. It might be useful to have a much simpler example. I still can't get a simple example to work since I don't appear to understand the calling parameters. On Wed, Apr 7, 2010 at 10:37 PM, Raul Miller <[email protected]> wrote: > On Wed, Apr 7, 2010 at 12:21 AM, Piet de Jong <[email protected]> wrote: >> One of the provided mathematics addons is LBFGS, the well known >> mathematical minimization routine. >> >> The downloaded J etc interface rom the Jsoftware website, the provided >> example appears to work fine on the given example. >> >> However I cannot understand the exact use of the routine. It seems that >> large arrays are being passed but there is little explanation of the what >> these arrays are. They are certainly different in "size" from what appears >> to be required from the description of the FORTRAN routine. >> >> Can anyone explain how to eg apply this routine in relatively simple >> circumstances? > > I do not use that routine myself. > > However when I search jsoftware.com for lbfgs, I see a fair number > of hits. And I wonder if there might be different versions with > the same name. > > So, first off: Did you use J's package manager to get > your copy? (And, are you using J6.02?) > > Also, did you read the comments that you see when > you run > open 'math/lbfgs' > ? > > (The point of my questions is to remove ambiguities, > I do not know enough yet to answer your questions.) > > Thank you, > > -- > Raul > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Piet de Jong -------------------------------------------------- View my current research at http://ssrn.com/author=619154 -------------------------------------------------- ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
