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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 This idea is discussed in this math.se question. Otherwise by identity nan/nan should equal 1, along with all the other consequences like (nan/nan)==1, (nan*1)==nan, etc.

Float('nan') represents nan (not a number) 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 But how do i check for it?

Isnan(parsefloat(geoff)) for checking whether any value is nan, instead of just numbers, see here

How do you test for nan in javascript? 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. 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. 37 it's a special case, nan is the only thing in javascript not equal to itself Although the other answers about strings vs the nan object are right too.

False however if i check that value i get

>>> df.iloc[1,0] nan so, why is the second option not working Is it possible to check for nan values using iloc This question previously used pd.np instead of np and.ix in addition to.iloc, but since these no longer exist, they have been edited out to keep it short and clear. Nan not being equal to nan is part of the definition of nan, so that part's easy

As for nan in [nan] being true, that's because identity is tested before equality for containment in lists. 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

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