What is NaN (Not a number)?
28/06/2018 · NaN is a term used in mathematics and computer science to describe a non-numeric value. It may also be a placeholder for an expected numeric result that cannot be defined as a floating point number. There are two primary types of ways in which NaN may be generated: 1) a mathematical calculation and 2) non-numeric input .
What is the Nan constant?
29/01/2022 · NaN Meaning In Math. Do you know what does NaN mean in math? NaN is a short form for Not a Number in mathematics. It is an undefined or unrepresentable value used in floating-point calculations. For example, when you search for the square root of a negative number, a NaN will be displayed in the results. NaN Meaning In Python
What is the value of Nan 0/0?
04/03/2022 · Short for “Not a Number”, even its name is a paradox. Only floating-point values can be NaN, meaning that from a type-system point of view, only numbers can be “not a number”. NaN’s actual behavior is even stranger, though. The most spectacular bit of weirdness is that NaN is not equal to itself.
What does Nanan mean?
Definition and Usage. The math.nan constant returns a floating-point nan (Not a Number) value. This value is not a legal number. The nan constant is equivalent to float ('nan').
What does NaN in math mean?
not a numberIEEE 754 floating point numbers can represent positive or negative infinity, and NaN (not a number). These three values arise from calculations whose result is undefined or cannot be represented accurately.
What is NaN example?
Short for not a number, in mathematics and computer programming NaN is an undefined or unrepresentable value, especially in floating-point calculations. For example, 0/0 or the square root of a negative number would return a NaN result.13-Nov-2018
What does a NaN score mean?
Not a NumberAnswer. NaN is short for Not a Number. NaN indicates that the monitoring system is not receiving any numeric data.
What does it mean to NaN?
child's word for a grandmother: The kids love staying with their nan at the weekend. [ as form of address ] Happy birthday, Nan. Thesaurus: synonyms, antonyms, and examples. a grandparent.7 days ago
Is NaN a panda?
Pandas treat None and NaN as essentially interchangeable for indicating missing or null values.20-May-2021
Is Numpy NaN?
isnan. Test element-wise for Not a Number (NaN), return result as a bool array.
How many NaNs are there?
It seems that the IEEE 754 standard defines 16,777,214 32-bit floating point values as NaNs, or 0.4% of all possible values.05-Nov-2013
What does NaN mean in miles?
Means “Not a number”. Usually comes up if the mileage was not entered properly.02-Oct-2020
What does NaN mean in games?
It stands for "Not a Number", implying that your high scores are invalid numbers.23-Feb-2015
Does NaN mean no?
Not a Number (NaN) represents an undefined number in floating-point operations. A Not a Number indicator may also be a sign that a variable that is supposed to be a numerical value has been corrupted by text characters or symbols.
Does NaN mean grandmother?
The word nan for grandma is a shortening of the word nana. Both of these words probably are child pronunciations of the word nanny. Etymonline describes this word as originating as a child's word for "female adult other than mother".27-Jul-2013
Why is NaN a number?
NaN stands for Not a Number. It is a value of numeric data types (usually floating point types, but not always) that represents the result of an invalid operation such as dividing by zero. Although its names says that it's not a number, the data type used to hold it is a numeric type.10-May-2010
Overview
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 floating-point arithmetic. Systematic use of NaNs was introduced by the IEEE 754 floating-point standard in 1985, along with the representation of other non-finite quantities such as infinities.
In mathematics, zero divided by zerois undefined and is therefore represented by NaN in computi…
Floating point
In floating-point calculations, NaN is not the same as infinity, although both are typically handled as special cases in floating-point representations of real numbers as well as in floating-point operations. An invalid operation is also not the same as an arithmetic overflow (which might return an infinity) or an arithmetic underflow (which would return the smallest normal number, a subnormal number, or zero).
Function definition
There are differences of opinion about the proper definition for the result of a numeric function that receives a quiet NaN as input. One view is that the NaN should propagate to the output of the function in all cases to propagate the indication of an error. Another view, and the one taken by the ISO C99 and IEEE 754-2008standards in general, is that if the function has multiple arguments and the output is uniquely determined by all the non-NaN inputs (including infinity), then that val…
Integer NaN
Most fixed-size integer formats cannot explicitly indicate invalid data. In such a case, when converting NaN to an integer type, the IEEE 754 standard requires that an invalid operation exception be signaled. For example in Java, such operations throw instances of java.lang.ArithmeticException. In C, they lead to undefined behavior, but if annex F is supported, the operation yields an "invalid" floating-point exception (as required by the IEEE standard) and a…
Display
Different operating systems and programming languages may have different string representations of NaN.
Since, in practice, encoded NaNs have a sign, a quiet/signaling bit and optional 'diagnostic information' (sometimes called a payload), these will occasionally be found in string representations of NaNs, too. Some examples are:
Encoding
In IEEE 754 standard-conforming floating-point storage formats, NaNs are identified by specific, pre-defined bit patterns unique to NaNs. The sign bit does not matter. Binary format NaNs are represented with the exponential field filled with ones (like infinity values), and some non-zero number in the significand field (to make them distinct from infinity values). The original IEEE 754 standard from 1985 (IEEE 754-1985) only described binary floating-point formats, and did not sp…
External links
• Not a Number, foldoc.org
• IEEE 754-2008 Standard for Floating-Point Arithmetic (subscription required)
• IEEE 754-2019 Standard for Floating-Point Arithmetic (subscription required)