Date: Mon, 20 Aug 2012 11:29:28 -0500 From: Stephen Montgomery-Smith <stephen@missouri.edu> To: freebsd-numerics@freebsd.org Subject: Re: Complex arg-trig functions Message-ID: <503265E8.3060101@missouri.edu> In-Reply-To: <502C0CF8.8040003@missouri.edu> References: <5017111E.6060003@missouri.edu> <501C361D.4010807@missouri.edu> <20120804165555.X1231@besplex.bde.org> <501D51D7.1020101@missouri.edu> <20120805030609.R3101@besplex.bde.org> <501D9C36.2040207@missouri.edu> <20120805175106.X3574@besplex.bde.org> <501EC015.3000808@missouri.edu> <20120805191954.GA50379@troutmask.apl.washington.edu> <20120807205725.GA10572@server.rulingia.com> <20120809025220.N4114@besplex.bde.org> <5027F07E.9060409@missouri.edu> <20120814003614.H3692@besplex.bde.org> <50295F5C.6010800@missouri.edu> <20120814072946.S5260@besplex.bde.org> <50297CA5.5010900@missouri.edu> <50297E43.7090309@missouri.edu> <20120814201105.T934@besplex.bde.org> <502A780B.2010106@missouri.edu> <20120815223631.N1751@besplex.bde.org> <502C0CF8.8040003@missouri.edu>
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On 08/15/12 15:56, Stephen Montgomery-Smith wrote: > On 08/15/2012 08:35 AM, Bruce Evans wrote: >> On Tue, 14 Aug 2012, Stephen Montgomery-Smith wrote: > > >>> It seemed to me that there is a logic behind why the the infs and nans >>> produce the results they do. I noticed that do_the_hard_work() >>> already got the answers correct for the real part *rx. Getting the >>> imaginary part to work as well seemed to me to be the cleanest way to >>> make it work. (I added all the nan and inf checking after writing the >>> rest of the code.) >> >> An up-front check may still be simpler, and gives more control. In >> csqrt*(), I needed an explicit check and special expressions to get >> uniform behaviour. After thinking about it some more, I decided to go with your approach. The additional checks were so very few, and the code becomes quite a bit simpler.
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