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# Function unequal

Test whether two values are unequal.

The function tests whether the relative difference between x and y is
larger than the configured epsilon. The function cannot be used to compare
values smaller than approximately 2.22e-16.

For matrices, the function is evaluated element wise.
In case of complex numbers, x.re must unequal y.re, or x.im must unequal y.im.
Strings are compared by their numerical value.

Values `null` and `undefined` are compared strictly, thus `null` is unequal
with everything except `null`, and `undefined` is unequal with everything
except `undefined`.


## Syntax

```js
math.unequal(x, y)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`x` | number &#124; BigNumber &#124; Fraction &#124; boolean &#124; Complex &#124; Unit &#124; string &#124; Array &#124; Matrix &#124; undefined | First value to compare
`y` | number &#124; BigNumber &#124; Fraction &#124; boolean &#124; Complex &#124; Unit &#124; string &#124; Array &#124; Matrix &#124; undefined | Second value to compare

### Returns

Type | Description
---- | -----------
boolean &#124; Array &#124; Matrix | Returns true when the compared values are unequal, else returns false


### Throws

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


## Examples

```js
math.unequal(2 + 2, 3)       // returns true
math.unequal(2 + 2, 4)       // returns false

const a = math.unit('50 cm')
const b = math.unit('5 m')
math.unequal(a, b)           // returns false

const c = [2, 5, 1]
const d = [2, 7, 1]

math.unequal(c, d)           // returns [false, true, false]
math.deepEqual(c, d)         // returns false

math.unequal(0, null)        // returns true
```


## See also

[equal](equal.md),
[deepEqual](deepEqual.md),
[smaller](smaller.md),
[smallerEq](smallerEq.md),
[larger](larger.md),
[largerEq](largerEq.md),
[compare](compare.md)