From bbo|ker @end|ng |rom gm@||@com  Thu Feb 21 18:02:57 2019
From: bbo|ker @end|ng |rom gm@||@com (Ben Bolker)
Date: Thu, 21 Feb 2019 12:02:57 -0500
Subject: [Rd] code for sum function
In-Reply-To: <e98672c8-ca55-ac34-5f2c-b55befc52077@comcast.net>
References: <c1495700-e265-4ff8-1f36-e149bd4d1961@gmail.com>
 <13de2483-4cb0-38eb-4bcc-138844a3c0a8@gmail.com>
 <CAOuLjjRV4cDb73re6JVsMsnVSgBNRdLEPrP=Z6cxSHtnUakUzw@mail.gmail.com>
 <e98672c8-ca55-ac34-5f2c-b55befc52077@comcast.net>
Message-ID: <CABghstTiOPRfJgFTgw7_V5UbG3wNn36oWHnch7YBfrbLwH_ZXw@mail.gmail.com>

Specifically: https://svn.r-project.org/R/trunk/src/main/summary.c

And if you don't want to deal with Subversion, you can look at the
read-only github mirror:

https://github.com/wch/r-source/blob/e5b21d0397c607883ff25cca379687b86933d730/src/main/summary.c#L115-L131

On Thu, Feb 21, 2019 at 11:57 AM David Winsemius <dwinsemius at comcast.net> wrote:
>
>
> On 2/20/19 2:55 PM, Rampal Etienne wrote:
> > Dear Tomas,
> >
> > Where do I find these files? Do they contain the code for the sum function?
>
> Yes.
>
> https://svn.r-project.org/R/trunk/
>
>
> David
>
> >
> > What do you mean exactly with your point on long doubles? Where can I find
> > documentation on this?
> >
> > Cheers, Rampal
> >
> > On Mon, Feb 18, 2019, 15:38 Tomas Kalibera <tomas.kalibera at gmail.com wrote:
> >
> >> See do_summary() in summary.c, rsum() for doubles. R uses long double
> >> type as accumulator on systems where available.
> >>
> >> Best,
> >> Tomas
> >>
> >> On 2/14/19 2:08 PM, Rampal Etienne wrote:
> >>> Hello,
> >>>
> >>> I am trying to write FORTRAN code to do the same as some R code I
> >>> have. I get (small) differences when using the sum function in R. I
> >>> know there are numerical routines to improve precision, but I have not
> >>> been able to figure out what algorithm R is using. Does anyone know
> >>> this? Or where can I find the code for the sum function?
> >>>
> >>> Regards,
> >>>
> >>> Rampal Etienne
> >>>
> >>> ______________________________________________
> >>> R-devel at r-project.org mailing list
> >>> https://stat.ethz.ch/mailman/listinfo/r-devel
> >>
> >>
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-devel at r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel
>
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel



[Rd] code for sum function
Ben Bolker