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Groups > comp.lang.python > #93318

Re: Linear time baseconversion

From Christian Gollwitzer <auriocus@gmx.de>
Newsgroups comp.lang.python
Subject Re: Linear time baseconversion
Date 2015-06-30 11:07 +0200
Organization A noiseless patient Spider
Message-ID <mmtm6k$8b7$1@dont-email.me> (permalink)
References <777831f0-d4b4-48f6-ae0b-c9b1ea7ffc06@googlegroups.com> <CALwzidms2BGRjHCuLB5_uszbx9Q-rdtOob_LGHQoO3K3ZD=Q7Q@mail.gmail.com> <mailman.175.1435619500.3674.python-list@python.org> <87r3ouawgt.fsf@bsb.me.uk> <7c6dac9d-5722-4179-bd7e-ceaac6698490@googlegroups.com>

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Am 30.06.15 um 10:52 schrieb jonas.thornvall@gmail.com:
> It still bug out on very big numbers if base outside integer scope.
> I am very keen on suggestions regarding the logic to make it faster.

Concerning the algorithmic complexity, it can't be faster than square 
time in the number of digits N. Baseconversion needs to do a sequence of 
division operations, where every operation gves you one digit in the new 
base. The number of digits in the new base is proportional to the number 
of digits in the old base (the ratio is log b1/log b2). Therefore it 
will be O(N^2).

	Christian

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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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