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Subject: Re: [boost] Is there interest in e_float: Multiple-precisionfloatand special functions?
From: Christopher Kormanyos (e_float_at_[hidden])
Date: 2011-06-10 15:07:02

OK, thanks John.   For generic elementary transcendental functions, Icould either template them or utilize the virtual mechanism.   I would prefer the templates. Do you have a preference?  Perhaps we should leave the option open to target up to millions of digits in future versions of e_float.(I mean quite a bit later, after building a solid basis for e_float in boost in the first place.) See next paragraph.   In addition, I have another (unpublished) program, an older one, that has architecture similar to e_float's. My other program goes up to ~100-million digits using multicore FFTs, etc. It does 10^6 digits of pi using an AGM algo. in about 10 seconds. So its performance isn't too shabby.  Sincerely, Chris From: John Maddock <boost.regex_at_[hidden]> To: boost_at_[hidden] Sent: Friday, June 10, 2011 12:38 PM Subject: Re: [boost] Is there interest in e_float: Multiple-precisionfloatand special functions? > I believe that we cleared up the license issues in recent private mails. Nod, apologies I dropped the ball on that one, but having now read and talked to the other moderators, I think we're OK.  There'll be an email invitation to the sandbox shortly. > In order to get the e_float core in the sandbox, we need to define how much we would initially like > to have in the core. > I might suggest: > - The real data type e_float, its base class and its interfaces to the big-number back ends. > - The specialization of std::numeric_limits<e_float>. > - The complex data type (ef_complex) > - Elementary transcendental functions (trig, power, log hyperbolic) for real and complex. > - (optional) Possibly the Gamma function and Zeta functions for real and complex. Nod. Ultimately it would be nice if: * The elementary functions could be made generic - it would be a huge help in getting other real-number types in Boost. * The special functions could be merged with our existing (generic) special function code base. HTH, John. _______________________________________________ Unsubscribe & other changes:

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