Equality operator error with exact same value

조회 수: 3(최근 30일)
I have the following code and it presents a bug:
data = 22.7:0.1:24.2; TEMP(1) = 23.1;
if TEMP(1) == data(5)
3-2 %this is only sample effect
else
5-2 %this is only sample effect
end
This outputs
3
But if I use
if TEMP(1) == 23.1
3-2 %this is only sample effect
else
5-2 %this is only sample effect
end
This outputs
1
You can see from the "data" matrix that data(5) is 23.1.
What kind of bug is this and how can I avoid this kind of bug in the future? I've tried 2 different PCs with different MATLAB versions and they both have the same problem.

채택된 답변

Steven Lord
Steven Lord 2022년 4월 13일
This is not a bug. See the section "Avoiding Common Problems with Floating-Point Arithmetic" on this documentation page.
  댓글 수: 2
Steven Lord
Steven Lord 2022년 4월 14일
No need to apologize. You aren't the first person to encounter this behavior (it's a common enough question that our documentation staff created a documentation page for it, after all) and you almost certainly won't be the last.

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