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Groups > comp.lang.python > #93313

Re: Linear time baseconversion

Newsgroups comp.lang.python
Date 2015-06-29 23:49 -0700
References <777831f0-d4b4-48f6-ae0b-c9b1ea7ffc06@googlegroups.com> <CALwzidms2BGRjHCuLB5_uszbx9Q-rdtOob_LGHQoO3K3ZD=Q7Q@mail.gmail.com> <mailman.175.1435619500.3674.python-list@python.org>
Message-ID <adc1ffef-5e45-4836-af39-6667b583cbd7@googlegroups.com> (permalink)
Subject Re: Linear time baseconversion
From jonas.thornvall@gmail.com

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Den tisdag 30 juni 2015 kl. 01:11:51 UTC+2 skrev Ian:
> On Mon, Jun 29, 2015 at 4:56 PM, Ian Kelly <ian.g.kelly@gmail.com> wrote:
> > On Mon, Jun 29, 2015 at 4:39 PM,  <jonas.thornvall@gmail.com> 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.

It isn't i used the power to check with wolfram, but there is a plus 1 bug as ben noticed.

But not in this slower version.
http://jt.node365.se/baseconversion5.html

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Linear time baseconversion jonas.thornvall@gmail.com - 2015-06-29 15:39 -0700
  Re: Linear time baseconversion Ian Kelly <ian.g.kelly@gmail.com> - 2015-06-29 16:56 -0600
  Re: Linear time baseconversion Ian Kelly <ian.g.kelly@gmail.com> - 2015-06-29 17:10 -0600
    Re: Linear time baseconversion jonas.thornvall@gmail.com - 2015-06-29 16:23 -0700
    Re: Linear time baseconversion Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-06-30 01:09 +0100
      Re: Linear time baseconversion jonas.thornvall@gmail.com - 2015-06-30 01:52 -0700
        Re: Linear time baseconversion Christian Gollwitzer <auriocus@gmx.de> - 2015-06-30 11:07 +0200
          Re: Linear time baseconversion jonas.thornvall@gmail.com - 2015-06-30 02:20 -0700
          Re: Linear time baseconversion jonas.thornvall@gmail.com - 2015-06-30 02:34 -0700
            Re: Linear time baseconversion jonas.thornvall@gmail.com - 2015-06-30 02:43 -0700
              Re: Linear time baseconversion jonas.thornvall@gmail.com - 2015-06-30 06:22 -0700
                Re: Linear time baseconversion jonas.thornvall@gmail.com - 2015-06-30 07:13 -0700
                Re: Linear time baseconversion Ian Kelly <ian.g.kelly@gmail.com> - 2015-06-30 09:29 -0600
          Re: Linear time baseconversion Ian Kelly <ian.g.kelly@gmail.com> - 2015-06-30 09:45 -0600
          Re: Linear time baseconversion Ian Kelly <ian.g.kelly@gmail.com> - 2015-06-30 09:40 -0600
            Re: Linear time baseconversion Christian Gollwitzer <auriocus@gmx.de> - 2015-07-01 00:22 +0200
          Re: Linear time baseconversion Chris Angelico <rosuav@gmail.com> - 2015-07-01 02:10 +1000
          Re: Linear time baseconversion Ian Kelly <ian.g.kelly@gmail.com> - 2015-06-30 10:34 -0600
            Re: Linear time baseconversion Christian Gollwitzer <auriocus@gmx.de> - 2015-07-01 00:27 +0200
    Re: Linear time baseconversion jonas.thornvall@gmail.com - 2015-06-29 23:49 -0700
  Re: Linear time baseconversion Michael Torrie <torriem@gmail.com> - 2015-06-30 10:12 -0600
    Re: Linear time baseconversion jonas.thornvall@gmail.com - 2015-06-30 09:24 -0700
      Re: Linear time baseconversion Michael Torrie <torriem@gmail.com> - 2015-06-30 13:55 -0600

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