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<h1 id="function-isnegative">Function isNegative <a href="#function-isnegative" title="Permalink">#</a></h1>

Test whether a value is negative: smaller than zero.
The function supports types `number`, `BigNumber`, `Fraction`, and `Unit`.

The function is evaluated element-wise in case of Array or Matrix input.


<h2 id="syntax">Syntax <a href="#syntax" title="Permalink">#</a></h2>

```js
math.isNegative(x)
```

<h3 id="parameters">Parameters <a href="#parameters" title="Permalink">#</a></h3>

Parameter | Type | Description
--------- | ---- | -----------
`x` | number &#124; BigNumber &#124; bigint &#124; Fraction &#124; Unit &#124; Array &#124; Matrix | Value to be tested

<h3 id="returns">Returns <a href="#returns" title="Permalink">#</a></h3>

Type | Description
---- | -----------
boolean | Returns true when `x` is larger than zero. Throws an error in case of an unknown data type.


<h3 id="throws">Throws <a href="#throws" title="Permalink">#</a></h3>

Type | Description
---- | -----------


<h2 id="examples">Examples <a href="#examples" title="Permalink">#</a></h2>

```js
math.isNegative(3)                     // returns false
math.isNegative(-2)                    // returns true
math.isNegative(0)                     // returns false
math.isNegative(-0)                    // returns false
math.isNegative(math.bignumber(2))     // returns false
math.isNegative(math.fraction(-2, 5))  // returns true
math.isNegative('-2')                  // returns true
math.isNegative([2, 0, -3])            // returns [false, false, true]
```


<h2 id="see-also">See also <a href="#see-also" title="Permalink">#</a></h2>

[isNumeric](isNumeric.html),
[isPositive](isPositive.html),
[isZero](isZero.html),
[isInteger](isInteger.html)