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NaN与任何其他值（包括NaN本身）进行比较的结果都是false，包括NaN == NaN。 这是因为NaN被定义为不等于任何其他值，甚至不等于它自己。 这是由于NaN的特殊性质导致的。 NaN的比较结果为false的原因是为了遵循IEEE 754浮点数标准，该标准规定了浮点数的比较方式。 Decidí investigar y lo más que encontré fue 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
Otherwise by identity nan/nan should equal 1, along with all the other consequences like (nan/nan)==1, (nan*1)==nan, etc. Tenía tiempo programando en javascript y nunca me había dado cuenta de esa peculiaridad que tiene con el valor nan In the land of real numbers, there are some operations that usually can be performed, but sometimes don't have a defined result
For example, let's look at logarithms.
182 i just came across this technique in the book effective javascript that is pretty simple 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?
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. 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? 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.
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