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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 where available. > > Best, > Tomas > > On 2/14/19 2:08 PM, Rampal Etienne wrote: > &gt...

...ame 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

...eal 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? Wh...

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...

...y put singles, like a constant 0.0 rather than a > constant 0.0D+0, into a double you will have small junk in the lower > precision part. > > (I am assuming you are talking about a sum of reals, not integer or > complex.) > > HTH, > Paul Gilbert > > 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 > >...

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,...

Someone said it used a possibly platform-dependent higher-than-double-precision type. By the way, in my example involving rep(1/3, n) I neglected to include the most precise way to calculate the sum: n%/%3 + (n%%3)/3. Bill Dunlap TIBCO Software wdunlap tibco.com On Wed, Feb 20, 2019 at 2:45 PM Rampal Etienne <rampaletienne at gmail.com> wrote: > Dear Will, > > This is exactly what I find. > My point is thus that the sum function in R is not a naive sum nor a > Kahansum (in all cases), but what algorithm is it using then? > > Cheers, Rampal > > > On Tue, Feb...

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Dear Will, This is exactly what I find. My point is thus that the sum function in R is not a naive sum nor a Kahansum (in all cases), but what algorithm is it using then? Cheers, Rampal On Tue, Feb 19, 2019, 19:08 William Dunlap <wdunlap at tibco.com wrote: > The algorithm does make a differece. You can use Kahan's summation > algorithm (https://en.wikipedia.org/wiki/Kahan_summation_algorithm) to > reduce the error compared to the naive summation algorithm. E....

...ave to specify it.) Then if you accidentally put singles, like a constant 0.0 rather than a constant 0.0D+0, into a double you will have small junk in the lower precision part. (I am assuming you are talking about a sum of reals, not integer or complex.) HTH, Paul Gilbert 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 than a >> constant 0.0D+0, into a double you will have small junk in the lower >> precision part. >> >> (I am assuming you are talking about a sum of reals, not integer or >> complex.) >> >> HTH, >> Paul Gilbert >> >> 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 ab...

Hi all, I have to buy a server machine and Run KVM on it. I just wanted to know what type of storage devices are supported by KVM. Thanks & Regards Anuj -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://listman.redhat.com/archives/libvirt-users/attachments/20100203/f921e0e8/attachment.htm>