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Nan is designed to propagate through all calculations, infecting them like a virus, so if somewhere in your deep, complex calculations you hit upon a nan, you don't bubble out a seemingly sensible answer As for nan in [nan] being true, that's because identity is tested before equality for containment in lists. Otherwise by identity nan/nan should equal 1, along with all the other consequences like (nan/nan)==1, (nan*1)==nan, etc.

182 i just came across this technique in the book effective javascript that is pretty simple Nan not being equal to nan is part of the definition of nan, so that part's easy Since nan is the only javascript value that is treated as unequal to itself, you can always test if a value is nan by checking it for equality to itself:

Float('nan') represents nan (not a number)

But how do i check for it? Nan can be used as a numerical value on mathematical operations, while none cannot (or at least shouldn't) None is an internal python type (nonetype) and would be more like inexistent or empty than numerically invalid in this context The main symptom of that is that, if you perform, say, an average or a sum on an.

Javascript automatic type conversion convert nan into number, so checking if a number is not a number will always b false And nan !== nan will be true. In numpy there are nan, nan and nan What's the sense of having all three, do they differ or any of these can be used interchangeably?

I would like to know why some languages like r has both na and nan

What are the differences or are they equally the same Is it really needed to have na? Nan stands for not a number, and this is not equal to 0 Although positive and negative infinity can be said to be symmetric about 0, the same can be said for any value n, meaning that the result of adding the two yields nan

This idea is discussed in this math.se question. I have a program that tries to shrink a double down to a desired number The output i get is nan What does nan mean in java?

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