Apr 16, 2010 · @Gothdo: sure, but I did ask how to check that a number is NaN, as opposed to any value.

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 …

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。 …

float('nan') represents NaN (not a number). But how do I check for it?

Dec 14, 2019 · What is a NaN value or NaN exactly (in the words of a non-math professor)? Let's suppose you're working with real numbers - numbers like 1, π, e, -137, 6.626, etc. In the land …

Jul 24, 2013 · 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?

Aug 8, 2011 · 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.

Jul 9, 2013 · NaN can be used as a numerical value on mathematical operations, while None cannot (or at least shouldn't). NaN is a numeric value, as defined in IEEE 754 floating-point …

Apr 2, 2016 · On my own I found a way to drop nan rows from a pandas dataframe. Given a dataframe dat with column x which contains nan values,is there a more elegant way to do drop …