[R] About the multiprecision computing package in R

Erin Hodgess er|nm@hodge@@ @end|ng |rom gm@||@com
Sat Mar 14 21:31:22 CET 2020


Got it!  Thanks!



On Sat, Mar 14, 2020 at 2:24 PM J C Nash <profjcnash using gmail.com> wrote:

> As I understand things, OpenBLAS will improve the performance of
> computations on regular IEEE 754 formats.
>
> I use Rmpfr for much longer numbers, e.g., 50 decimal digits, which --
> depending on scale of numbers in a
> vector -- can mean one needs approximately 100 decimals to accumulate the
> dot product. As I indicated, I
> have not been able to verify the internals. Probably I'll have to dig.
> However, for the moment I'm using
> David Smith's FM-Fortran, which offers a dot product function which does
> appear to do this.
>
> JN
>
> On 2020-03-14 4:17 p.m., Erin Hodgess wrote:
> > Are you using a PC, please?  You may want to consider installing
> OpenBLAS.  It’s a bit tricky but worth the time/effort.
> >
> > Thanks,
> > Erin
> >
> >
> > On Sat, Mar 14, 2020 at 2:10 PM J C Nash <profjcnash using gmail.com <mailto:
> profjcnash using gmail.com>> wrote:
> >
> >     Rmpfr does "support" matrix algebra, but I have been trying for some
> >     time to determine if it computes "double" precision (i.e., double the
> >     set level of precision) inner products. I suspect that it does NOT,
> >     which is unfortunate. However, I would be happy to be wrong about
> >     this.
> >
> >     JN
> >
> >     On 2020-03-14 3:41 p.m., Bert Gunter wrote:
> >     > Read its documentation yourself and unless you have good reason
> not to,
> >     > always cc the list (which I have done here).
> >     >
> >     >
> >     > Bert Gunter
> >     >
> >     > "The trouble with having an open mind is that people keep coming
> along and
> >     > sticking things into it."
> >     > -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
> >     >
> >     >
> >     > On Sat, Mar 14, 2020 at 12:28 PM 林伟璐 <13917987541 using 163.com <mailto:
> 13917987541 using 163.com>> wrote:
> >     >
> >     >> Thanks. Does it support matrix algebra?
> >     >>
> >     >>
> >     >>
> >     >> 林伟璐
> >     >> 邮箱:13917987541 using 163.com <mailto:13917987541 using 163.com>
> >     >>
> >     >>
> >     <
> https://maas.mail.163.com/dashi-web-extend/html/proSignature.html?iconUrl=http%3A%2F%2Fmail-online.nosdn.127.net%2F17c23bc1722125aa6261c33736f525c5.jpg&name=%E6%9E%97%E4%BC%9F%E7%92%90&uid=13917987541%40163.com&ftlId=1&items=%5B%22%E9%82%AE%E7%AE%B1%EF%BC%9A13917987541%40163.com%22%5D
> >
> >     >>
> >     >> 签名由 网易邮箱大师 <https://mail.163.com/dashi/dlpro.html?from=mail88> 定制
> >     >>
> >     >> On 03/15/2020 03:18, Bert Gunter <bgunter.4567 using gmail.com <mailto:
> bgunter.4567 using gmail.com>> wrote:
> >     >> Use google instead, as I recommended. If that's impossible in
> China, you
> >     >> should state that and what you tried (Baidu) in your query.
> >     >>
> >     >> You'll get the Rmpfr package.
> >     >>
> >     >> Bert Gunter
> >     >>
> >     >> "The trouble with having an open mind is that people keep coming
> along and
> >     >> sticking things into it."
> >     >> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
> >     >>
> >     >>
> >     >> On Sat, Mar 14, 2020 at 11:48 AM 林伟璐 <13917987541 using 163.com
> <mailto:13917987541 using 163.com>> wrote:
> >     >>
> >     >>> Thanks, I tried Baidu but get nothing
> >     >>>
> >     >>>
> >     >>>
> >     >>> 林伟璐
> >     >>> 邮箱:13917987541 using 163.com <mailto:13917987541 using 163.com>
> >     >>>
> >     >>>
> >     <
> https://maas.mail.163.com/dashi-web-extend/html/proSignature.html?iconUrl=http%3A%2F%2Fmail-online.nosdn.127.net%2F17c23bc1722125aa6261c33736f525c5.jpg&name=%E6%9E%97%E4%BC%9F%E7%92%90&uid=13917987541%40163.com&ftlId=1&items=%5B%22%E9%82%AE%E7%AE%B1%EF%BC%9A13917987541%40163.com%22%5D
> >
> >     >>>
> >     >>> 签名由 网易邮箱大师 <https://mail.163.com/dashi/dlpro.html?from=mail88>
> 定制
> >     >>>
> >     >>> On 03/15/2020 02:44, Bert Gunter <bgunter.4567 using gmail.com
> <mailto:bgunter.4567 using gmail.com>> wrote:
> >     >>> Here's a novel idea:
> >     >>> Do a google search on "multiprecision computing package R" for
> an answer.
> >     >>>
> >     >>> Bert Gunter
> >     >>>
> >     >>> "The trouble with having an open mind is that people keep coming
> along
> >     >>> and sticking things into it."
> >     >>> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip
> )
> >     >>>
> >     >>>
> >     >>> On Sat, Mar 14, 2020 at 10:36 AM 林伟璐 <13917987541 using 163.com
> <mailto:13917987541 using 163.com>> wrote:
> >     >>>
> >     >>>> Dear all
> >     >>>>
> >     >>>>
> >     >>>> I need a multiprecision computing package in R, if anyone in
> the list
> >     >>>> knows, please let me known...
> >     >>>>
> >     >>>>
> >     >>>> Many thanks
> >     >>>>
> >     >>>>
> >     >>>> Weilu Lin
> >     >>>>         [[alternative HTML version deleted]]
> >     >>>>
> >     >>>> ______________________________________________
> >     >>>> R-help using r-project.org <mailto:R-help using r-project.org> mailing
> list -- To UNSUBSCRIBE and more, see
> >     >>>> https://stat.ethz.ch/mailman/listinfo/r-help
> >     >>>> PLEASE do read the posting guide
> >     >>>> http://www.R-project.org/posting-guide.html
> >     >>>> and provide commented, minimal, self-contained, reproducible
> code.
> >     >>>>
> >     >>>
> >     >
> >     >       [[alternative HTML version deleted]]
> >     >
> >     > ______________________________________________
> >     > R-help using r-project.org <mailto:R-help using r-project.org> mailing list
> -- To UNSUBSCRIBE and more, see
> >     > https://stat.ethz.ch/mailman/listinfo/r-help
> >     > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> >     > and provide commented, minimal, self-contained, reproducible code.
> >     >
> >
> >     ______________________________________________
> >     R-help using r-project.org <mailto:R-help using r-project.org> mailing list --
> To UNSUBSCRIBE and more, see
> >     https://stat.ethz.ch/mailman/listinfo/r-help
> >     PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> >     and provide commented, minimal, self-contained, reproducible code.
> >
> > --
> > Erin Hodgess, PhD
> > mailto: erinm.hodgess using gmail.com <mailto:erinm.hodgess using gmail.com>
>
-- 
Erin Hodgess, PhD
mailto: erinm.hodgess using gmail.com

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