[Rd] code for sum function

[Ben Bolker]

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 using 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 using 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 using r-project.org mailing list
> >>> https://stat.ethz.ch/mailman/listinfo/r-devel
> >>
> >>
> >       [[alternative HTML version deleted]]
> >
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