Equality operator error with exact same value

3 次查看（过去 30 天）
Glenn Franco Gacal
Glenn Franco Gacal 2022-4-13
评论： Steven Lord 2022-4-14
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.

请先登录，再回答此问题。

采纳的回答

Steven Lord
Steven Lord 2022-4-13
This is not a bug. See the section "Avoiding Common Problems with Floating-Point Arithmetic" on this documentation page.
  2 个评论
Glenn Franco Gacal
Glenn Franco Gacal 2022-4-14
Thank you for your clarification and I apologize for this noob dilemma!
Steven Lord
Steven Lord 2022-4-14
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.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by