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Re: Unexpected NANs in complex arithmetic

From Paul Rubin <no.email@nospam.invalid>
Newsgroups comp.lang.python
Subject Re: Unexpected NANs in complex arithmetic
Date 2016-06-21 23:25 -0700
Organization A noiseless patient Spider
Message-ID <87wplhwxht.fsf@nightsong.com> (permalink)
References <5769fc9b$0$1622$c3e8da3$5496439d@news.astraweb.com> <CAPTjJmrHcHM9RT5jZ=zAJ-bPavTQ12Mnp4HpLB4KwQsrSZtLTw@mail.gmail.com> <mailman.23.1466564278.11516.python-list@python.org> <nkd25i$8cv$1@dont-email.me> <576a2d6d$0$11089$c3e8da3@news.astraweb.com>

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Steven D'Aprano <steve+comp.lang.python@pearwood.info> writes:
>> By the time Python returns a result for inf+3j, you're already in
>> trouble (or perhaps Python is already in trouble).
> I don't see why. It is possible to do perfectly sensible arithmetic on INFs.

We sometimes think of the real line extended by +/- inf, or the complex
plane extended by a single point at infinity.  I'm not sure how to do
sensible arithmetic on a number like inf+3j, that doesn't treat it as
the same number as inf+4j.

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Thread

Unexpected NANs in complex arithmetic Steven D'Aprano <steve@pearwood.info> - 2016-06-22 12:48 +1000
  Re: Unexpected NANs in complex arithmetic Chris Angelico <rosuav@gmail.com> - 2016-06-22 12:57 +1000
    Re: Unexpected NANs in complex arithmetic Dan Sommers <dan@tombstonezero.net> - 2016-06-22 03:54 +0000
      Re: Unexpected NANs in complex arithmetic Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-06-22 16:17 +1000
        Re: Unexpected NANs in complex arithmetic Paul Rubin <no.email@nospam.invalid> - 2016-06-21 23:25 -0700
        Re: Unexpected NANs in complex arithmetic Chris Angelico <rosuav@gmail.com> - 2016-06-22 16:30 +1000
          Re: Unexpected NANs in complex arithmetic Dan Sommers <dan@tombstonezero.net> - 2016-06-22 22:54 +0000
    Re: Unexpected NANs in complex arithmetic Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-06-22 16:58 +1000
      Re: Unexpected NANs in complex arithmetic Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-06-22 17:05 +1000
  Re: Unexpected NANs in complex arithmetic Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-22 09:14 +0200
  Re: Unexpected NANs in complex arithmetic Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2016-06-22 10:18 +0100

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