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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.
182 i just came across this technique in the book effective javascript that is pretty simple 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 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:
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? Float('nan') represents nan (not a number) But how do i check for it? 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. 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. 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. 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?
16 nan means not a number and is the result of undefined operations on floating point numbers like for example dividing zero by zero Nan stands for not a number, and this is not equal to 0
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