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