[R] About the multiprecision computing package in R

Jeff Newmiller
Sat, 14 Mar 2020 20:28:54 -0000

Not sure I understand the concern. IEEE 754 double precision floating point was
invented to allow for avoiding loss of precision when manipulating single
precision floating point numbers... but then C just ignores single precision and
you are expected to know that the precision of your answers may only be relied
on at single precision for certain operations.

Wouldn't you just set Rmpfr precision to double your actual desired
precision and move on? Though I suppose you might consider  more than doubling
the desired precision to deal with exponentiation [1].

[1] https://en.m.wikipedia.org/wiki/Extended_precision#Working_range

On March 14, 2020 1:10:19 PM PDT, J C Nash <profjcnash at 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 ??? <13917987541 at 163.com>
wrote:
>>
>>> Thanks. Does it support matrix algebra?
>>>
>>>
>>>
>>> ???
>>> ???13917987541 at 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>
>>>
>>> ??? ??????
<https://mail.163.com/dashi/dlpro.html?from=mail88> ??
>>>
>>> On 03/15/2020 03:18, Bert Gunter <bgunter.4567 at 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 ??? <13917987541 at 163.com>
wrote:
>>>
>>>> Thanks, I tried Baidu but get nothing
>>>>
>>>>
>>>>
>>>> ???
>>>> ???13917987541 at 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>
>>>>
>>>> ??? ??????
<https://mail.163.com/dashi/dlpro.html?from=mail88> ??
>>>>
>>>> On 03/15/2020 02:44, Bert Gunter <bgunter.4567 at
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 ??? <13917987541 at
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 at 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 at 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 at 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.

--
Sent from my phone. Please excuse my brevity.