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Created on 2014-08-04 17:29 by Larry, last changed 2022-04-11 14:58 by admin. This issue is now closed.
| Messages (2) | |||
|---|---|---|---|
| msg224747 - (view) | Author: (Larry) | Date: 2014-08-04 17:29 | |
Certain values close to the rounding boundary are rounded down instead of up; and this is done somewhat inconsistently.
#Example (python v2.7.8, and previous)
#almost an odd-even pattern, but not quite
for x in [1.045, 1.145, 1.245, 1.345, 1.445, 1.545, 1.645, 1.745, 1.845, 1.945]:
print "{0:.3f} => {0:.2f}".format(x)
#while ..6 rounds up correctly
for x in [1.046, 1.146, 1.246, 1.346, 1.446, 1.546, 1.646, 1.746, 1.846, 1.946]:
print "{0:.3f} => {0:.2f}".format(x)
|
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| msg224773 - (view) | Author: Ned Deily (ned.deily) *  |
Date: 2014-08-04 20:47 | |
What you are seeing is due to the limitations of binary floating-point arithmetic. The issue is described in more detail in the Python tutorial: https://docs.python.org/2/tutorial/floatingpoint.html#tut-fp-issues |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:58:06 | admin | set | github: 66332 |
| 2014-08-04 20:47:14 | ned.deily | set | status: open -> closed nosy: + ned.deily messages: + msg224773 resolution: not a bug stage: resolved |
| 2014-08-04 17:29:57 | Larry | create | |