# why is NaN not of 'NaN type' in Simulink?

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Nicolas CRETIN el 2 de Mayo de 2024
Comentada: Nicolas CRETIN el 6 de Mayo de 2024
Hi everyone,
Please, could anyone explain why the constant block NaN is not of type NaN?
Best regards,
Nicolas
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Nicolas CRETIN el 2 de Mayo de 2024
To solve the problem I first converted my input into a string and then I applied a string comparison:
But this is still a weird behaviour

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Paul el 2 de Mayo de 2024
It looks like the block labeled "assertion1" is a Compare To Constant block.
Instead use a Relational Operator block, which supports isNaN functionality.
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Nicolas CRETIN el 6 de Mayo de 2024
Oh, right thank you!

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### Más respuestas (1)

Steven Lord el 2 de Mayo de 2024
By the definition of NaN, NaN is not equal to anything (including itself.) This is documented on the documentation pages for the NaN function as well as the documentation page for the == operator.
If you can call MATLAB functions in your model, use isequaln to perform equality testing including treating NaN as equal to NaN.
x = NaN;
x == x % false
ans = logical
0
isequal(x, x) % false
ans = logical
0
isequaln(x, x) % true
ans = logical
1
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Nicolas CRETIN el 2 de Mayo de 2024
Thanks a lot!

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