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 …

Apr 16, 2010 · 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 …

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

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.

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 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 standard. None …

Jul 13, 2013 · 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, …

Dec 2, 2013 · 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.

Apr 11, 2010 · 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?