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Equation is correct but logically false???

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Florent Dueme
Florent Dueme 2017-12-9
评论： Star Strider 2017-12-10
Hi all,
I can´t make any sense of this. I have this very simple equation that is equal to 0.1 according to Matlab itself. Yet when I try to create an if statement where something happens if the value is equal to 0.1 Matlab tells me the statement is logically false:
>> a = 11
a =
11
>> (a/10)-(floor(a/10))
ans =
0.1000
>> (a/10)-(floor(a/10))==0.1
ans =
logical
0
Even weirder, it works fine when the equation equals another number like 0.6 or 0.7 (but not 0.2 or 0.3).
Any help understanding this would be very welcome!
  2 个评论
Florent Dueme
Florent Dueme 2017-12-10
Thanks a lot for the links and sorry for the boring question! Wasn´t sure what to look for as I didn´t know it was a floating-point numbers issue.

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采纳的回答

Star Strider
Star Strider 2017-12-9
This is one of the better discussions on the problem you are experiencing: Why is 0.3 - 0.2 - 0.1 (or similar) not equal to zero? (link).

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