From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM autolearn=unavailable autolearn_force=no version=3.4.4 X-Received: by 10.200.36.124 with SMTP id d57mr12561439qtd.15.1493671571190; Mon, 01 May 2017 13:46:11 -0700 (PDT) X-Received: by 10.157.14.91 with SMTP id n27mr522017otd.8.1493671571146; Mon, 01 May 2017 13:46:11 -0700 (PDT) Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!news.eternal-september.org!news.eternal-september.org!feeder.eternal-september.org!2.eu.feeder.erje.net!feeder.erje.net!2.us.feeder.erje.net!feeder.usenetexpress.com!feeder1.iad1.usenetexpress.com!border1.nntp.dca1.giganews.com!nntp.giganews.com!c45no957336qtb.1!news-out.google.com!v18ni2457ita.0!nntp.google.com!c26no1487586itd.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail Newsgroups: comp.lang.ada Date: Mon, 1 May 2017 13:46:10 -0700 (PDT) In-Reply-To: Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=76.113.92.25; posting-account=lJ3JNwoAAAAQfH3VV9vttJLkThaxtTfC NNTP-Posting-Host: 76.113.92.25 References: <3e7f9789-a0af-4342-a42e-46a6258d7801@googlegroups.com> User-Agent: G2/1.0 MIME-Version: 1.0 Message-ID: <516be18c-b83e-457b-8f46-a6d8719e0134@googlegroups.com> Subject: Re: Many overlook the possibility sin(x,360.0) ? From: Shark8 Injection-Date: Mon, 01 May 2017 20:46:11 +0000 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Xref: news.eternal-september.org comp.lang.ada:46652 Date: 2017-05-01T13:46:10-07:00 List-Id: On Monday, May 1, 2017 at 2:04:13 PM UTC-6, Dmitry A. Kazakov wrote: > On 2017-05-01 19:46, Nasser M. Abbasi wrote: > > On 5/1/2017 12:22 AM, reinert wrote: >=20 > >> Not a big philosophical question, but: > >> > >> I have often seen in (others) Ada code that many prefer to use for > >> example sin(x) > >> where they first calculate x :=3D rad_per_degree*degrees. > >> > >> Why they do not use sin(degrees,360.0) if they need to use degree. > >> Are there a good reason? Using sin(x, 3600.0) seems to keep the code > >> simpler. Sometimes I even use sin(x,period). >=20 > I remember the first thing they taught us during the first semester was= =20 > to ditch degrees... That is honestly stupid; given how I remember it being done "in the name of= 'accuracy' -- the problem is that it's not more accurate: 90=C2=B0 *IS* = =CF=80/2 radians. Difficulty/complexity of handling is completely discrete from accuracy, and= if we wanted a good constant for circles it would be 2=CF=80 -- as shown h= ere: http://www.math.utah.edu/%7Epalais/pi.pdf (see also: http://tauday.com= /tau-manifesto )