adding to the points above:

3)  after downloading the source package (stats) containung arima,
     rename it (my.arima) and then do the changes.

Kjetil

On Tue, Mar 3, 2009 at 5:29 PM, Carlos J. Gil Bellosta <cgb@datanalytics.com
> wrote:

> Hello,
>
> I do not think that is the way to go. If you believe that your algorithm
> is better than the existing one, talk to the author of the package and
> discuss the improvement. The whole community will benefit.
>
> If you want to tune the existing function and tailor it to your needs,
> you have several ways to go, among them:
>
> 1) Copy the existing function into a new file, edit it and load it via
> source.
>
> 2) Download the source package and modify it for your own purposes.
>
> Best regards,
>
> Carlos J. Gil Bellosta
> http://www.datanalytics.com
>
>
> On Tue, 2009-03-03 at 18:20 +0100, Marc Anonym wrote:
> > Dear members of the list,
> >
> > I'm a beginner in R and I'm having some trouble with: "Error in
> > optim(init[mask], armafn, method = "BFGS", hessian = TRUE, control =
> > optim.control,  :
> >   non-finite finite-difference value [8]"
> >
> > when running "arima".
> >
> > I've seen that some people have come accross the same problem:
> > https://stat.ethz.ch/pipermail/r-help/2008-August/169660.html
> >
> > So I'd like to modify the code of arima to change the optimization
> function
> > with another one that handles these problems automatically , however I
> don't
> > find the way to do it and
> > http://tolstoy.newcastle.edu.au/R/e6/help/09/01/2476.html points out a
> way
> > that doesn't work for me:
> >
> > * If I type edit(arima) and I modify it, changes are not saved,
> > * If I copy the code and I save it like a different function, I get the
> hard
> > error: "Error in Delta %+% c(1, -1) : object "R_TSconv" not found"
> >
> > Anybody can give me a hint? I miss matlab's easy way of doing this ("edit
> > function.m").
> >
> > Thanks in advance
> >
> > MarC (Acompany)
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

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