From tom@@@k@||ber@ @end|ng |rom gm@||@com  Mon Feb 18 16:38:57 2019
From: tom@@@k@||ber@ @end|ng |rom gm@||@com (Tomas Kalibera)
Date: Mon, 18 Feb 2019 16:38:57 +0100
Subject: [Rd] code for sum function
In-Reply-To: <c1495700-e265-4ff8-1f36-e149bd4d1961@gmail.com>
References: <c1495700-e265-4ff8-1f36-e149bd4d1961@gmail.com>
Message-ID: <13de2483-4cb0-38eb-4bcc-138844a3c0a8@gmail.com>

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
>
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[Rd] code for sum function
Tomas Kalibera