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 In addition, I have another (unpublished) program, an older one, that has architecture similar to e_float's. My other program goes up to ~100-million digits using multicore FFTs, etc.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@virgin.net> To: boost@lists.boost.org 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 http://cacm.acm.org/about-communications/author-center/acm-copyright-policy/ 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: http://lists.boost.org/mailman/listinfo.cgi/boost