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!
Seeking numerical package for quadruple precision...
Started by ●July 3, 2007
Reply by ●July 3, 20072007-07-03
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" <abc@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! > > > >
Reply by ●July 4, 20072007-07-04
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-
Reply by ●July 4, 20072007-07-04
"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!
Reply by ●July 4, 20072007-07-04
Vista wrote:> "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?Count the bits and figure it out. There's no black magic to it; it's all made out of parts. Jerry -- Engineering is the art of making what you want from things you can get. ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Reply by ●July 4, 20072007-07-04
Vista wrote:> 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.MIRACL> Moreover, are there popular quadruple precision packages? Please recommend > the fastest one. I am really in huge need of speed.And what is the problem to develop such a basic thing yourself? Vladimir Vassilevsky DSP and Mixed Signal Design Consultant http://www.abvolt.com
Reply by ●July 4, 20072007-07-04
On 4 Jul, 14:21, "Vista" <a...@gmai.com> wrote:> I need 30 digits of precision digits.Just out of curiousity - why? Rune
Reply by ●July 4, 20072007-07-04
Vladimir Vassilevsky wrote:> > > Vista wrote: > >> 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. > > MIRACL > >> Moreover, are there popular quadruple precision packages? Please >> recommend the fastest one. I am really in huge need of speed. > > And what is the problem to develop such a basic thing yourself?I drove someone's assertive grandmother on an errand, and she screamed when I turned left off the road, "There's a car coming!" I answered that the car would pass well behind us (which it did) and she asked indignantly how I could know that. I told her that knowing it was part of being a competent driver. She answered, again indignantly, "Well, I didn't know it" to which I answered, "That's an easy syllogism. Draw your own conclusion." Vista seems to believe that quad precision is "much faster" than double precision. What conclusion are we to draw? Jerry -- Engineering is the art of making what you want from things you can get. ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
Reply by ●July 4, 20072007-07-04
Rune Allnor wrote:> On 4 Jul, 14:21, "Vista" <a...@gmai.com> wrote: > >> I need 30 digits of precision digits. > > Just out of curiousity - why?It's not clear "Vista" knows/understands the "why"...he's posted similar topic in c.l.fortran and so far the answers have been anything but enlightening. I've been wondering where he's going to get the 30 digits of precision for the initialization to start from myself... :) --
Reply by ●July 4, 20072007-07-04
On Jul 4, 7:21 am, "Vista" <a...@gmai.com> wrote:> "Le Chaud Lapin" <jaibudu...@gmail.com> wrote in messagenews: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!I think you mean to ask for "multiple precision", not "quadruple" precision. In C++, one of the top dogs for speed is GMP. http://gmplib.org/ To a C++ programmer, the naming using in the code might be surprising. For example, if you are looking for the "big integer" class, don't expect it to be named "Integer" or anything like that. Same for floating-point. -Le Chaud Lapin-
