[Rd] contribution offer: df() for non-centrality != 0

[Martin Maechler]

Thank you, Peter,

but note that this is clearly too late for 2.3.0 :
If you look at the release schedule at
   http://developer.R-project.org/ 
you see that  April 10 was "Feature Freeze".

If it looks good -- and it does after a quick glimpse --
it should be possible to be integrated for 2.3.1 though -- but
that is not at all scheduled yet. 

With regards, 
Martin


>>>>> "PetRd" == Peter Ruckdeschel <Peter.Ruckdeschel at uni-bayreuth.de>
>>>>>     on Thu, 13 Apr 2006 15:15:11 +0200 writes:

    PetRd> Hi R-devels, I noticed that for the scheduled R
    PetRd> 2.3.0, there is still no function df() for
    PetRd> non-centrality != 0.

    PetRd> Easter is quickly approaching, so as my little gift,
    PetRd> I would like to offer you some code to fill this gap:

    PetRd> After excluding some "unusual" cases, it amounts to
    PetRd> differentiating the corresponding function pnf() ---
    PetRd> which in turn leads to the function dnbeta() already
    PetRd> available in the stats package for some time.

    PetRd> You may find this code in

    PetRd> http://www.uni-bayreuth.de/departments/math/org/mathe7/R-devel/dnf.tar.gz

    PetRd> This archive includes the C-File dnf.c as well as
    PetRd> some adapted versions Fdist_new.Rd and distn_new.R;
    PetRd> in the latter two files I indicated all modifications
    PetRd> w.r.t.  Fdist.Rd and distn.R by a corresponding
    PetRd> %%-tag.

    PetRd> You may modify these files as you like in order to
    PetRd> conform your design principles

    PetRd> --- and hopefully we will soon have df() for ncp,
    PetRd> too...