Otherwise by identity nan/nan should equal 1, along with all the other consequences like (nan/nan)==1, (nan*1)==nan, etc. Nan is can be terribly destructive to your program, if allowed to proliferate it can introduce hard to find bugs 182 i just came across this technique in the book effective javascript that is pretty simple
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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? In my opinion, the value read to that dictionary entry should be none but instead nan is assigned Surely none is more descriptive of an empty cell as it has a null value, whereas nan just says that the value read is not a number Is my understanding correct, what is the difference between none and nan
Why is nan assigned instead of none? 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. 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 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? Thats why nan != nan because each nan value represents some unique unknown number
Nans are necessary because floating point numbers have a limited range of values.
Just a note, 1 oz of prevention is better than 1 lb of cure In other words, preventing 0.f/0.f from ever being executed is far better than retroactively checking for nan 's in your code
