|
Confusing Math
|
|
Jan-18-2018, 10:19 PM
I'm trying to understand why python has issues with simple math.
If you try to subtract 0.92 from 1 (1-.92) the answer you get is 0.07999999999999996 rather than 0.08 Anybody know why?
Jan-18-2018, 10:30 PM
(This post was last modified: Jan-18-2018, 10:30 PM by Gribouillis.)
It is because the number cannot be represented exactly in base 2. This page explains the issue. By the way, this is not specific to python. Every system that stores floating numbers according to the ieee-754 standard has the same limitations.
Jan-18-2018, 10:47 PM
More About Floating Points
If you want to be precise. Then you have to use fractions.Fraction. from fractions import Fraction a = Fraction(1) b = Fraction(92, 100) print(float(a - b))
99 percent of computer problems exists between chair and keyboard.
|
|
|
| Possibly Related Threads… | |||||
| Thread | Author | Replies | Views | Last Post | |
| math.log versus math.log10 | stevendaprano | 10 | 2,400 |
May-23-2022, 08:59 PM Last Post: jefsummers |
|
| Confusing in [for loop] topic | Sherine | 11 | 3,500 |
Jul-31-2021, 02:53 PM Last Post: deanhystad |
|
| Why getting ValueError : Math domain error in trig. function, math.asin() ? | jahuja73 | 3 | 3,764 |
Feb-24-2021, 05:09 PM Last Post: bowlofred |
|
| Confusing logic | Blob | 4 | 2,401 |
Nov-18-2019, 03:26 AM Last Post: Blob |
|
| Confusing output from 2to3 about what files need change | Moonwatcher | 1 | 4,826 |
Dec-30-2018, 04:07 PM Last Post: Gribouillis |
|
| IndentationError message could be confusing to new programmers | insearchofanswers87 | 1 | 2,342 |
May-16-2018, 05:05 PM Last Post: Larz60+ |
|
| Some Confusing Program Errors (Newbie stuff) | WildPictus | 1 | 2,788 |
Sep-03-2017, 05:00 PM Last Post: hbknjr |
|
| CPU utilisation is confusing | Bidgey225 | 6 | 5,179 |
Mar-20-2017, 01:49 PM Last Post: nilamo |
|
