Date: Fri, 21 Aug 2009 19:38:49 +1000 From: Peter Jeremy <peterjeremy@optushome.com.au> To: freebsd-arch@FreeBSD.ORG Subject: Re: C99 Complex Math Functions Message-ID: <20090821093849.GA33774@server.vk2pj.dyndns.org> In-Reply-To: <20090820230400.GA61066@troutmask.apl.washington.edu> References: <20090815015947.GA4682@server.vk2pj.dyndns.org> <20090817201319.GA22437@zim.MIT.EDU> <20090820230400.GA61066@troutmask.apl.washington.edu>
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--XsQoSWH+UP9D9v3l Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2009-Aug-20 16:04:00 -0700, Steve Kargl <sgk@troutmask.apl.washington.ed= u> wrote: >On Mon, Aug 17, 2009 at 04:13:19PM -0400, David Schultz wrote: >> On Sat, Aug 15, 2009, Peter Jeremy wrote: >> > I've recently had a requirement for the C99 complex math functions. >> > I know you have been doing some work on implementing functions in >> > complex.h and wonder what (if any) plans you have for implementing >> > the rest of the C99 functions. >>=20 >> Which ones do you need? cacos, cacosh, casin, casinh, catan, catanh, ccos, ccosh, cexp, clog, cpow, csin, csinh, ctan, ctanh :-) >> Many of the functions can be fudged with some simple formulas that >> you can look up. I have all the simple formulae. >> The simple formulas work great in most cases, >> but often fail near asymptotes and for special cases (infinity, >> NaN, underflow, etc.) And simplistic implementations can lose significant amounts of precision as well. >In a private response to Peter, I directed him to NetBSD. Thanks for that. I've also discovered that math/gsl also implements the required functions (though with non-standard names and argument types). Since I already have gsl available, I might use it instead. (As a warning for anyone else interested in math/gsl - it's complex functions are implemented very simplisticly - no better than NetBSD). --=20 Peter Jeremy --XsQoSWH+UP9D9v3l Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.12 (FreeBSD) iEYEARECAAYFAkqOaykACgkQ/opHv/APuIf7xQCcDiVq+12gFn3b76a1xiJED+Ok ppcAoKJHuZPToapOz7lETx6BcN3aj93R =U+rf -----END PGP SIGNATURE----- --XsQoSWH+UP9D9v3l--
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