Path: csiph.com!optima2.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!1.eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed8.news.xs4all.nl!newsgate.cistron.nl!newsgate.news.xs4all.nl!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 0.006 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'bug.': 0.07; 'remaining': 0.07; 'seemed': 0.07; 'subject:skip:b 10': 0.07; 'noted,': 0.09; 'python.': 0.11; 'instead.': 0.15; 'output': 0.15; '4:39': 0.16; 'wrote:': 0.16; 'input': 0.18; 'discussion': 0.20; 'appears': 0.23; '2015': 0.23; 'header:In-Reply-To:1': 0.24; 'somewhere': 0.24; 'mon,': 0.24; 'testing': 0.25; 'message-id:@mail.gmail.com': 0.28; 'decimal': 0.29; 'url:se': 0.29; 'subject:time': 0.31; 'point': 0.33; 'received:google.com': 0.34; 'to:addr:python-list': 0.35; 'list,': 0.36; 'subject:: ': 0.37; 'times.': 0.38; 'rather': 0.38; 'pm,': 0.39; 'to:addr:python.org': 0.39; 'back': 0.61; 'default': 0.61; 'results': 0.66; 'to:name:python': 0.84; 'doubling': 0.91 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; bh=eHiXmxiN3xF2fv/1hxIwtPWv0BSWln2bRPTnjpY2Nec=; b=dTeMsORCTHSBxRc1sgOzNc7kvgzznNIYWgHg3fjcsfdkX4GzCUkow+yZ4BPekybCal RYuGyKkELeS8oycJjA5d1G2XHQhqF2LxHFr32s7Xh1qzTVjghXGqvNevxh73efyw1bhp ZUTBGYBdeTQI34Z7x92W4PRp+eKPVf8XjH7moVQl5y9LuC9Zr7Kw+Lo2+Hzx9+aJQUvs LSdOKagJzOoALyKDijauLW0mTTi80wHaFn560YQ4gQHZXO00n5vN8i6uN3N7BO6N6HR+ 9xg7VCJz82nQhiI9OnJ0afoafGgfVimNF4Ga9NdAXbLDKl1+eSwonS8BxkyCs7f84Vlm wtlw== X-Received: by 10.129.56.70 with SMTP id f67mr21897331ywa.85.1435619492155; Mon, 29 Jun 2015 16:11:32 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: <777831f0-d4b4-48f6-ae0b-c9b1ea7ffc06@googlegroups.com> From: Ian Kelly Date: Mon, 29 Jun 2015 17:10:52 -0600 Subject: Re: Linear time baseconversion To: Python Content-Type: text/plain; charset=UTF-8 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.20+ 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: 17 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1435619500 news.xs4all.nl 2857 [2001:888:2000:d::a6]:40927 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:93300 On Mon, Jun 29, 2015 at 4:56 PM, Ian Kelly wrote: > On Mon, Jun 29, 2015 at 4:39 PM, wrote: >> http://jt.node365.se/baseconversion8.html > > Back of the envelope mental calculation, that appears to be quadratic, > not linear. Doubling the length of the input results in an approximate > quadrupling of the time taken to produce the output. > > That noted, this is off-topic for this list, which is for discussion > about Python. Please take this to somewhere else like > comp.lang.javascript instead. By the way, I think you have a bug. I did my time testing by concatenating the default input number to itself several times. At 5184 decimal digits, which was the last case I tried, the 58th output digit was 1111111, after which point the remaining 672 output digits are all 12665464, which seemed rather improbable.