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Re: Linear time baseconversion

References (4 earlier) <7c6dac9d-5722-4179-bd7e-ceaac6698490@googlegroups.com> <mmtm6k$8b7$1@dont-email.me> <CALwzidkHuWJkqFEDHp6LT2UJxHh6sHZM=2qde0acrSvp12vyRw@mail.gmail.com> <CALwzidnTP_2k-m0iRn5=nEHmNzQoDDw45g58gDXXa9kYhJnbiQ@mail.gmail.com> <CAPTjJmrSp3BCyaJuO=m-k97XH2r_XORNDTPpVam=5YwEObYpOg@mail.gmail.com>
From Ian Kelly <ian.g.kelly@gmail.com>
Date 2015-06-30 10:34 -0600
Subject Re: Linear time baseconversion
Newsgroups comp.lang.python
Message-ID <mailman.196.1435682093.3674.python-list@python.org> (permalink)

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On Tue, Jun 30, 2015 at 10:10 AM, Chris Angelico <rosuav@gmail.com> wrote:
> When there's a simple ratio between the bases, it's fairly
> straight-forward to convert a few digits at a time. Converting base
> 256 into base 64, for instance, can be done by taking three digits and
> yielding four. But within that, you would still need a complete table
> of all sixteen million possibilities, if you want to do the lookup
> table. And that only works when there is that kind of relationship.

You're right. I was thinking that for base 5 to base 7, for instance,
one could read digits in groups of 7, but that doesn't work out; you
can't map any discrete number of base 5 digits to a corresponding
number of base 7 digits.

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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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