Numerical errors of basic multiple
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yifwang
am 26 Aug. 2019
Kommentiert: yifwang
am 26 Aug. 2019
When using matlab multiple calculation, some errors happen
a = 7*13e-6;
b = 6*13e-6;
the answer is
a = 9.09999999999999999e-5
b = 7.80000000000000000e-5
erroe happened at a but not at b;
So how this error happen and how * works? On what condition the error happen?
2 Kommentare
KALYAN ACHARJYA
am 26 Aug. 2019
Error?
>> a =13e-6
a =
1.300000000000000e-05
>> 7*a
ans =
9.099999999999999e-05
Akzeptierte Antwort
Ted Shultz
am 26 Aug. 2019
These are floating point calculations. Not every number can be represented, and this rounding error can compound when you do math with these imperfect numbers.
"Floating-point error arises because real numbers cannot, in general, be accurately represented in a fixed space."
1 Kommentar
Ted Shultz
am 26 Aug. 2019
Here is a thread, with links to other threads that address this in more detail:
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