# 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.

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

## Syntax

``````unequal(x, y)
``````

### Parameters

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

### Returns

Type Description
boolean | Array | Matrix Returns true when the compared values are unequal, else returns false

## Examples

``````unequal(2 + 2, 3);       // returns true
unequal(2 + 2, 4);       // returns false

var a = unit('50 cm');
var b = unit('5 m');
unequal(a, b);           // returns false

var c = [2, 5, 1];
var d = [2, 7, 1];

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

unequal(0, null);        // returns true
``````