Re: Floating point minimum and maximum exponent values

From	Serhiy Storchaka <storchaka@gmail.com>
Subject	Re: Floating point minimum and maximum exponent values
Date	2013-07-16 20:21 +0300
References	<ks3bl6$g8o$1@speranza.aioe.org> <CAPTjJmqzAvXr2t71M5SnEXp8-Axsy-SPQrGiHU7nD-c2FqVqXw@mail.gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.4776.1373995308.3114.python-list@python.org> (permalink)

Show all headers | View raw

16.07.13 15:04, Chris Angelico написав(ла):
> Piece of extreme oddity, this.
>
>>>> help(sys.float_info)
> ... lots of other info ...
>   |  max_exp
>   |      DBL_MAX_EXP -- maximum int e such that radix**(e-1) is representable
>   |
>   |  min_exp
>   |      DBL_MIN_EXP -- minimum int e such that radix**(e-1) is a
> normalized float
> ...
>
> So it's technically correct. Followup question: Why is it off by one?

sys.float_info.max == sys.float_info.radix**sys.float_info.max_exp - 
sys.float_info.radix**(sys.float_info.max_exp-sys.float_info.mant_dig)

Back to comp.lang.python | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Floating point minimum and maximum exponent values Marco <m.b@gmail.com> - 2013-07-16 13:43 +0200
  Re: Floating point minimum and maximum exponent values Chris Angelico <rosuav@gmail.com> - 2013-07-16 22:04 +1000
  Re: Floating point minimum and maximum exponent values Christian Heimes <christian@python.org> - 2013-07-16 14:46 +0200
  Re: Floating point minimum and maximum exponent values Serhiy Storchaka <storchaka@gmail.com> - 2013-07-16 20:21 +0300

csiph-web