isNaN.md (1362B)
1 <!-- Note: This file is automatically generated from source code comments. Changes made in this file will be overridden. --> 2 3 # Function isNaN 4 5 Test whether a value is NaN (not a number). 6 The function supports types `number`, `BigNumber`, `Fraction`, `Unit` and `Complex`. 7 8 The function is evaluated element-wise in case of Array or Matrix input. 9 10 11 ## Syntax 12 13 ```js 14 math.isNaN(x) 15 ``` 16 17 ### Parameters 18 19 Parameter | Type | Description 20 --------- | ---- | ----------- 21 `x` | number | BigNumber | Fraction | Unit | Array | Matrix | Value to be tested 22 23 ### Returns 24 25 Type | Description 26 ---- | ----------- 27 boolean | Returns true when `x` is NaN. Throws an error in case of an unknown data type. 28 29 30 ### Throws 31 32 Type | Description 33 ---- | ----------- 34 35 36 ## Examples 37 38 ```js 39 math.isNaN(3) // returns false 40 math.isNaN(NaN) // returns true 41 math.isNaN(0) // returns false 42 math.isNaN(math.bignumber(NaN)) // returns true 43 math.isNaN(math.bignumber(0)) // returns false 44 math.isNaN(math.fraction(-2, 5)) // returns false 45 math.isNaN('-2') // returns false 46 math.isNaN([2, 0, -3, NaN]') // returns [false, false, false, true] 47 ``` 48 49 50 ## See also 51 52 [isNumeric](isNumeric.md), 53 [isNegative](isNegative.md), 54 [isPositive](isPositive.md), 55 [isZero](isZero.md), 56 [isInteger](isInteger.md)