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| Date | Tue, 16 Jul 2013 22:04:25 +1000 |
| Subject | Re: Floating point minimum and maximum exponent values |
| From | Chris Angelico <rosuav@gmail.com> |
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On Tue, Jul 16, 2013 at 9:43 PM, Marco <m.b@gmail.com> wrote: > Hi all, why the maximum and minimum exp values are 1024 and -1021?: > >>>> sys.float_info > sys.float_info(max=1.7976931348623157e+308, max_exp=1024, max_10_exp=308, > min=2.2250738585072014e-308, min_exp=-1021, min_10_exp=-307, dig=15, > mant_dig=53, epsilon=2.220446049250313e-16, radix=2, rounds=1) > > The values (in double precision) 0 and 2047 are reserved for zero, infinity > and NaN (in combination with the fraction), so I was expecting -1022 and > 1023... 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? ChrisA
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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
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