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NaN是什么 NaN == NaN 的结果是什么?为什么? - 知乎 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。
floating point - Why is NaN not equal to NaN? - Stack Overflow 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
What is the difference between Null, NaN and undefined in JavaScript . . . What is the difference between Null, NaN and undefined in JavaScript? I have come across all three values, and have understood them to be “there isn’t anything here” in the context I found them- but I was hoping for a more detailed explanation as to why they occur, as well as what they mean in different contexts (for example- against an
python - How to check if particular value (in cell) is NaN in pandas . . . 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? Editor's note: 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