[Rd] code for sum function

Tomas Kalibera tom@@@k@||ber@ @end|ng |rom gm@||@com
Mon Feb 18 16:38:57 CET 2019


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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