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FAQ.What does the NAN code mean?

Answer:
NanMeaning
1Invalid square root (negative number, usually)
2Invalid addition (indeterminate such as infinity + (-infinity))
4Invalid division (indeterminate such as 0/0)
8Invalid multiplication (indeterminate such as 0*infinity)
9Invalid modulo such as (a mod 0)
17Try to convert invalid string to a number like val("x7")
33Invalid argument in a trig function
34Invalid argument in an inverse trig function
36Invalid argument in a log function
37Invalid argument in Pow function
38Invalid argument in toolbox financial function
40Invalid argument in hyperbolic function
42Invalid argument in a gamma function

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