2019年12月14日 · In computing, NaN, standing for not a number, is a member of a numeric data type that can be interpreted as a value that is undefined or unrepresentable, especially in …

2015年10月28日 · if NaN is the input of a floating operation, the output also tends to be NaN. there are several possible values for NaN 0x7fc00000, 0x7fc00001, 0x7fc00002, although …

2013年7月13日 · 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, …

2010年12月22日 · NA is for missing data. NaN, as J.M. said is for arithmetic purpose. NaN is usually the product of some arithmetic operation, such as 0/0. NA usually is declared in …

A NaN implemented following the standard, is the only value for which the inequality comparison with itself should return True: def is_nan(x): return (x != x) And some examples: import numpy …

2013年7月24日 · Different operating systems and programming languages may have different string representations of NaN: nan NaN NaN% NAN NaNQ NaNS qNaN sNaN 1.#SNAN …

2013年7月9日 · 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 …

2012年9月24日 · Not a Number or NaN is a computational construct, that came along with parsers and programmatic limitations, and its output can be assigned different meaning …

so basically NaN,NAN and nan are equivalent definitions of nan or in other words. NaN and NAN are aliases of nan. np.nan np.NaN np.NAN

NaN values in a vector are treated as different unique elements. For example, unique([1 1 NaN NaN]) returns the row vector [1 NaN NaN]. Use the isnan or ismissing function to detect NaN …