search for: do_summari

Dear Tomas, Where do I find these files? Do they contain the code for the sum function? 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

I am curious to know what algorithm R's mean function uses. Is there some reference to the numerical properties of this algorithm? I found the following C code in summary.c:do_summary(): case REALSXP: PROTECT(ans = allocVector(REALSXP, 1)); for (i = 0; i < n; i++) s += REAL(x)[i]; s /= n; if(R_FINITE((double)s)) { for (i = 0; i < n; i++) t += (REAL(x)[i] -

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,

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

Dear Rampal, you can download R source code in form of a tarball or from subversion, please see https://cran.r-project.org/doc/manuals/R-admin.html#Obtaining-R https://cran.r-project.org/doc/manuals/R-admin.html#Using-Subversion-and-rsync There is also a web access to subversion, so specifically the sum is available in https://svn.r-project.org/R/trunk/src/main/summary.c The definition of

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

"sum" (and perhaps other functions?) allows partial argument name matching after its three-dots argument: > sum(1:4, NA, n=78, na.rm=FALSE) [1] 10 > sum(1:4, NA, n=78, na.rm=TRUE) [1] 11 I can see there could be a discussion about whether or not this is a bug, but I think all will agree that it's a might peculiar. This is done in 2.0.1 but the same behavior is in 1.8.1.

Hello R-devel, As mentioned on Fosstodon [1] and discussed during RCOH [2], named arguments to sum(), min(), max() and prod() are currently processed the same way as the un-named ones. Additionally, when specifying the na.rm argument more than once, the last specified value is silently taken into account. Most of this behaviour is exactly as documented, but it's arguably a source of mistakes

On 2023-04-15 6:00 am, r-devel-request at r-project.org wrote: > Date: Fri, 14 Apr 2023 13:38:00 +0300 > From: Ivan Krylov<krylov.r00t at gmail.com> > To:r-devel at r-project.org > Subject: [Rd] sum(), min(), max(), prod() vs. named arguments in ... Message-ID: <20230414133800.75383dae-6792 at arachnoid> > Content-Type: text/plain; charset="us-ascii" > >

Signed-off-by: Jerone Young <jyoung5@us.ibm.com> -- Jerone Young IBM Linux Technology Center jyoung5@us.ibm.com 512-838-1157 (T/L: 678-1157) _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel