57 lines
1.3 KiB
Markdown
57 lines
1.3 KiB
Markdown
<!-- Note: This file is automatically generated from source code comments. Changes made in this file will be overridden. -->
|
|
|
|
# Function isNaN
|
|
|
|
Test whether a value is NaN (not a number).
|
|
The function supports types `number`, `BigNumber`, `Fraction`, `Unit` and `Complex`.
|
|
|
|
The function is evaluated element-wise in case of Array or Matrix input.
|
|
|
|
|
|
## Syntax
|
|
|
|
```js
|
|
math.isNaN(x)
|
|
```
|
|
|
|
### Parameters
|
|
|
|
Parameter | Type | Description
|
|
--------- | ---- | -----------
|
|
`x` | number | BigNumber | Fraction | Unit | Array | Matrix | Value to be tested
|
|
|
|
### Returns
|
|
|
|
Type | Description
|
|
---- | -----------
|
|
boolean | Returns true when `x` is NaN. Throws an error in case of an unknown data type.
|
|
|
|
|
|
### Throws
|
|
|
|
Type | Description
|
|
---- | -----------
|
|
|
|
|
|
## Examples
|
|
|
|
```js
|
|
math.isNaN(3) // returns false
|
|
math.isNaN(NaN) // returns true
|
|
math.isNaN(0) // returns false
|
|
math.isNaN(math.bignumber(NaN)) // returns true
|
|
math.isNaN(math.bignumber(0)) // returns false
|
|
math.isNaN(math.fraction(-2, 5)) // returns false
|
|
math.isNaN('-2') // returns false
|
|
math.isNaN([2, 0, -3, NaN]') // returns [false, false, false, true]
|
|
```
|
|
|
|
|
|
## See also
|
|
|
|
[isNumeric](isNumeric.md),
|
|
[isNegative](isNegative.md),
|
|
[isPositive](isPositive.md),
|
|
[isZero](isZero.md),
|
|
[isInteger](isInteger.md)
|