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Created on 2019-10-10 16:01 by Behzad Seyfi, last changed 2022-04-11 14:59 by admin. This issue is now closed.
| Messages (3) | |||
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| msg354391 - (view) | Author: Behzad Seyfi (Behzad Seyfi) | Date: 2019-10-10 16:01 | |
>>> 1/1e-323 inf >>> 1/1e-324 Traceback (most recent call last): File "<stdin>", line 1, in <module> ZeroDivisionError: float division by zero in a 1/x fraction, up to x = 1e-324 it is inf but when x = 1e-325 or little it throws ZeroDivisionError. It is not acceptable and accountable behaviour for inf definition. |
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| msg354395 - (view) | Author: STINNER Victor (vstinner) *  |
Date: 2019-10-10 16:19 | |
That's not a bug: 64-bit float of IEEE 754 rounds 1e-324 to 0.0. vstinner@apu$ python3 Python 3.7.4 (default, Jul 9 2019, 16:32:37) [GCC 9.1.1 20190503 (Red Hat 9.1.1-1)] on linux Type "help", "copyright", "credits" or "license" for more information. >>> 1e-324 0.0 >>> import sys >>> 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) >>> sys.float_info.min 2.2250738585072014e-308 >>> sys.float_info.min.hex() '0x1.0000000000000p-1022' >>> 1/0.0 Traceback (most recent call last): File "<stdin>", line 1, in <module> ZeroDivisionError: float division by zero >>> 1/1e-324 Traceback (most recent call last): File "<stdin>", line 1, in <module> ZeroDivisionError: float division by zero |
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| msg354477 - (view) | Author: Serhiy Storchaka (serhiy.storchaka) * |
Date: 2019-10-11 17:57 | |
See https://en.wikipedia.org/wiki/Denormal_number. |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:59:21 | admin | set | github: 82613 |
| 2019-10-11 17:57:16 | serhiy.storchaka | set | nosy:
+ serhiy.storchaka messages: + msg354477 |
| 2019-10-10 16:19:04 | vstinner | set | status: open -> closed nosy: + vstinner messages: + msg354395 resolution: not a bug stage: resolved |
| 2019-10-10 16:01:41 | Behzad Seyfi | create | |