Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!eu.feeder.erje.net!eweka.nl!lightspeed.eweka.nl!194.109.133.81.MISMATCH!newsfeed.xs4all.nl!newsfeed2.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 0.072 X-Spam-Evidence: '*H*': 0.86; '*S*': 0.00; 'lesser': 0.07; 'logic': 0.09; 'measure': 0.09; 'contribute': 0.11; 'foot': 0.16; 'measurement': 0.16; 'measures.': 0.16; 'received:65.55.116.32': 0.16; 'received:blu0-omc1-s21.blu0.hotmail.com': 0.16; 'roy': 0.16; 'sorts': 0.16; 'stake': 0.16; 'tape': 0.16; 'thu,': 0.19; 'to:name:python-list@python.org': 0.22; 'error': 0.23; 'driven': 0.24; 'received:65.55.116': 0.24; 'url:home': 0.24; 'second': 0.26; 'world,': 0.26; 'header:In-Reply-To:1': 0.27; 'skip:- 40': 0.29; 'topic': 0.29; "doesn't": 0.30; 'errors': 0.30; 'url:mailman': 0.30; 'too.': 0.31; 'datum': 0.31; 'probably': 0.32; 'url:python': 0.33; 'older': 0.33; 'third': 0.33; 'date:': 0.34; 'url:listinfo': 0.36; 'url:org': 0.36; 'error.': 0.37; 'example,': 0.37; 'two': 0.37; 'email addr:python.org': 0.37; 'depends': 0.38; 'to:addr:python-list': 0.38; 'subject:': 0.39; 'to:addr:python.org': 0.39; 'url:mail': 0.40; 'even': 0.60; 'contributing': 0.60; 'ground': 0.60; 'most': 0.60; 'digital': 0.61; 're:': 0.63; 'real': 0.63; 'more': 0.64; 'distance': 0.65; 'email name:python-list': 0.65; 'smith': 0.68; 'fact,': 0.69; 'other.': 0.75; 'analysis': 0.75; 'distance.': 0.91; 'feet': 0.93; '2013': 0.98 X-TMN: [UH/L/pLyd/mVHMmzZ+F1+wgj2lKoA65n] X-Originating-Email: [carlosnepomuceno@outlook.com] From: Carlos Nepomuceno To: "python-list@python.org" Subject: RE: Short-circuit Logic Date: Fri, 31 May 2013 03:03:08 +0300 Importance: Normal In-Reply-To: <4dofq8pjvfbtjlkvks4lolsnltktvbuvf5@invalid.netcom.com> References: <51a4b5a1$0$29966$c3e8da3$5496439d@news.astraweb.com>, <04b90c02-833a-4bad-88ad-ab71178b8f79@googlegroups.com>, <48519aa0-d0cd-4ffc-a2f5-2107465321d8@qn4g2000pbc.googlegroups.com>, , <51a6b969$0$29966$c3e8da3$5496439d@news.astraweb.com>, , <51a6e6b8$0$11118$c3e8da3@news.astraweb.com>, , , <4dofq8pjvfbtjlkvks4lolsnltktvbuvf5@invalid.netcom.com> Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginalArrivalTime: 31 May 2013 00:03:09.0068 (UTC) FILETIME=[3BD3FCC0:01CE5D92] 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: 48 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1369958598 news.xs4all.nl 15990 [2001:888:2000:d::a6]:52407 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:46562 ----------------------------------------=0A= > To: python-list@python.org=0A= > From: wlfraed@ix.netcom.com=0A= > Subject: Re: Short-circuit Logic=0A= > Date: Thu=2C 30 May 2013 19:38:31 -0400=0A= >=0A= > On Thu=2C 30 May 2013 08:48:59 -0400=2C Roy Smith declaim= ed=0A= > the following in gmane.comp.python.general:=0A= >=0A= >>=0A= >> Analysis of error is a complicated topic (and is much older than digital= =0A= >> computers). These sorts of things come up in the real world=2C too. For= =0A= >> example=2C let's say I have two stakes driven into the ground 1000 feet= =0A= >> apart. One of them is near me and is my measurement datum.=0A= >>=0A= >> I want to drive a third stake which is 1001 feet away from the datum.=0A= >> Do I measure 1 foot from the second stake=2C or do I take out my=0A= >> super-long tape measure and measure 1001 feet from the datum?=0A= >=0A= > On the same azimuth? Using the "super long tape" and ensuring it=0A= > traverses the 1000 foot stake is probably going to be most accurate --=0A= > you only have the uncertainty of the positioning of the tape on the=0A= > datum=2C and the small uncertainty of azimuth over the 1000 foot stake.= =0A= > And even the azimuth error isn't contributing to the distance error.=0A= >=0A= > Measuring 1 foot from the 1000 foot stake leaves you with any error=0A= > from datum to the 1000 foot=2C plus any error from the 1000 foot=2C PLUS = any=0A= > azimuth error which would contribute to shortening the datum distance.=0A= =0A= Just because you have more causes of error doesn't mean you have lesser acc= urate measures.=0A= =0A= If fact=2C errors may compensate each other. It all depends on the bias (ac= curacy) and variation (precision) involved in the measurements you are cons= idering.=0A= =0A= > --=0A= > Wulfraed Dennis Lee Bieber AF6VN=0A= > wlfraed@ix.netcom.com HTTP://wlfraed.home.netcom.com/=0A= >=0A= > --=0A= > http://mail.python.org/mailman/listinfo/python-list =