Re: Seeking numerical package for quadruple precision...

Vista — Wed, 04 Jul 2007 05:21:12 -0400

"Le Chaud Lapin" <jaibuduvin@gmail.com> wrote in message
news:1183534955.773488.278220@k79g2000hse.googlegroups.com...
> On Jul 3, 8:53 pm, "Vista" <a...@gmai.com> wrote:
>> I mean, I am looking for the fastest one, not just any one...
>>
>> I know from Google there are quite a few quadruple packages out there.
>>
>> But I need the fastest ones... Speed is really critical...
>>
>> "Vista" <a...@gmai.com> wrote in message
>>
>> news:f6etbs$2of$1@news.Stanford.EDU...
>>
>> > Hi all,
>>
>> > I have some computation and simulation which need quadruple precision.
>> > I
>> > mean, the double precision is not enough, while high precision such as
>> > 1000 digits is not needed, and that's too slow. I guess quadruple
>> > precision exactly fits my problem and should be much faster than double
>> > precision.
>>
>> > Could anybody tell me if MS Visual C++, or Intel C, Intel Fortran have
>> > already got quadruple precision in them and they are fully supported on
>> > Intel based cpus? I guess Intel Fortran has quadruple precision, but
>> > since
>> > I prefer C/C++ so my first choices are within C/C++ languages.
>>
>> > Moreover, do GSL, Intel MKL, and IMSL etc. have got quadruple precision
>> > support? I only need +, -, *, /, exp, and log.
>>
>> > I eventually have to do everything in C/C++ so I am primarily looking
>> > for
>> > numerical libraries, instead of Matlab or Maple or Mathematica's
>> > symbolic
>> > capability.
>>
>> > But if you know how to "simulate" quadruple precision in Matlab or
>> > Maple,
>> > or Mathematica, in order to see if an algorithm will overslow when
>> > converting into C/C++/Fortran, please let me know. I want to do the
>> > algorithm design in Matlab, and test if it will overflow, before
>> > converting everything into C/C++/Fortran.
>>
>> > If you know how to "simulate" quadruple precision in Matlab, Maple or
>> > Mathematica even with the symbolic toolbox, please let me know too...
>> > this
>> > is for algorithm design and testing...
>>
>> > Moreover, are there popular quadruple precision packages? Please
>> > recommend
>> > the fastest one. I am really in huge need of speed.
>>
>> > Thank you very much!
>
> In C++:
>
> long double x;
>
> You can tweak the compiler options for optimum speed on your
> particular CPU.
>
> -Le Chaud Lapin-
>

I need 30 digits of precision digits. Will "long double" give me that?

Thanks!

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Re: Seeking numerical package for quadruple precision...