Path: csiph.com!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed3.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.047 X-Spam-Evidence: '*H*': 0.93; '*S*': 0.02; 'position,': 0.05; 'subject:Python': 0.06; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'message-id:@4ax.com': 0.16; 'numerically': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'integrate': 0.24; 'url:home': 0.24; "haven't": 0.24; 'header:X-Complaints-To:1': 0.27; 'url:%3a': 0.30; '-0700,': 0.31; 'go.': 0.31; 'subject: (': 0.35; 'but': 0.35; 'there': 0.35; 'bought': 0.36; 'much.': 0.36; 'url:ref': 0.36; 'done': 0.36; 'charset:us-ascii': 0.36; 'received:76': 0.38; 'url:amazon': 0.38; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'john': 0.61; 'laid': 0.84; 'touched': 0.84; 'url:url': 0.91; 'url:%2c': 0.93; 'url:n': 0.93; '2013': 0.98 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Dennis Lee Bieber Subject: Re: Complex literals (was Re: I am never going to complain about Python again) Date: Wed, 16 Oct 2013 13:22:41 -0400 Organization: IISS Elusive Unicorn References: <525753ee$0$29984$c3e8da3$5496439d@news.astraweb.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Gmane-NNTP-Posting-Host: adsl-76-249-17-176.dsl.klmzmi.sbcglobal.net X-Newsreader: Forte Agent 6.00/32.1186 X-No-Archive: YES X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 21 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1381944171 news.xs4all.nl 15985 [2001:888:2000:d::a6]:43561 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:56885 On Tue, 15 Oct 2013 22:27:34 -0700, John Nagle declaimed the following: > If you have to numerically integrate torques to get >angular velocity, and angular velocity to get angular position, >quaternions are the way to go. If you want to understand >all this, there's a good writeup in one of the Graphics Gems >books. > There are a couple of texts dedicated just to quartenions... http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Dstripbooks&field-keywords=quarternions&rh=n%3A283155%2Ck%3Aquarternions I have the Kuipers, may have the Vince -- though the date is problematic; bought them as my prior job touched on them in some applications, but as I was laid off in October 2011, haven't done much. -- Wulfraed Dennis Lee Bieber AF6VN wlfraed@ix.netcom.com HTTP://wlfraed.home.netcom.com/