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Re: Floating point calculation problem

References (2 earlier) <keisev$7v1$1@dont-email.me> <mailman.1291.1359804020.2939.python-list@python.org> <keitk2$hln$1@dont-email.me> <mailman.1292.1359805138.2939.python-list@python.org> <keiujd$o71$1@dont-email.me>
Date 2013-02-02 22:58 +1100
Subject Re: Floating point calculation problem
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.1293.1359806334.2939.python-list@python.org> (permalink)

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On Sat, Feb 2, 2013 at 10:51 PM, Schizoid Man <schiz_man@21stcentury.com> wrote:
>> If your input has no decimal point in it, eval (or input) will return
>> an integer, not a float. Other than that, I can't see any obvious
>> reason for there to be a difference. Can you put together a simple
>> script that demonstrates the problem and post it, along with the exact
>> input that you're giving it, and the different outputs?
>
>
> Understood. I'm trying to learn Python by porting an ODE solver I wrote over
> from C#, so what I'll do is break down the routine and append a small code
> snippet highlighting the difference.

Thanks, I think I can speak for all of us in expressing appreciation
for that effort! It makes the job so much easier.

> I know this is probably redundant but Python 2.7.3 is running on a Mac and
> 3.3.0 on a PC, so it's not exactly an apples-v-apples comparison.

Ah, there may well be something in that. Definitely post the code and
outputs; chances are someone'll spot the difference.

ChrisA

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Thread

Floating point calculation problem "Schizoid Man" <schiz_man@21stcentury.com> - 2013-02-02 10:27 +0000
  Re: Floating point calculation problem Chris Angelico <rosuav@gmail.com> - 2013-02-02 21:34 +1100
    Re: Floating point calculation problem "Schizoid Man" <schiz_man@21stcentury.com> - 2013-02-02 11:14 +0000
      Re: Floating point calculation problem Chris Angelico <rosuav@gmail.com> - 2013-02-02 22:20 +1100
        Re: Floating point calculation problem "Schizoid Man" <schiz_man@21stcentury.com> - 2013-02-02 11:34 +0000
          Re: Floating point calculation problem Chris Angelico <rosuav@gmail.com> - 2013-02-02 22:38 +1100
            Re: Floating point calculation problem "Schizoid Man" <schiz_man@21stcentury.com> - 2013-02-02 11:51 +0000
              Re: Floating point calculation problem Chris Angelico <rosuav@gmail.com> - 2013-02-02 22:58 +1100
                Re: Floating point calculation problem "Schizoid Man" <schiz_man@21stcentury.com> - 2013-02-02 15:48 +0000
                Re: Floating point calculation problem "Schizoid Man" <schiz_man@21stcentury.com> - 2013-02-02 15:54 +0000
                Re: Floating point calculation problem Chris Angelico <rosuav@gmail.com> - 2013-02-03 03:00 +1100
                Re: Floating point calculation problem Michael Torrie <torriem@gmail.com> - 2013-02-02 11:19 -0700
                Re: Floating point calculation problem Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-03 12:25 +1100
                Re: Floating point calculation problem Dave Angel <d@davea.name> - 2013-02-02 21:20 -0500
                Re: Floating point calculation problem Michael Torrie <torriem@gmail.com> - 2013-02-02 21:22 -0700
              Re: Floating point calculation problem Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-02 23:11 +1100
      Re: Floating point calculation problem Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-02 22:45 +1100
        Re: Floating point calculation problem "Schizoid Man" <schiz_man@21stcentury.com> - 2013-02-02 11:50 +0000
  Re: Floating point calculation problem Chris Rebert <clp2@rebertia.com> - 2013-02-02 02:47 -0800
  Re: Floating point calculation problem Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-02 23:05 +1100

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