# Function unaryMinus #

Inverse the sign of a value, apply a unary minus operation.

For matrices, the function is evaluated element wise. Boolean values and strings will be converted to a number. For complex numbers, both real and complex value are inverted.

## Syntax #

```
math.unaryMinus(x)
```

### Parameters #

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

`x` |
number | BigNumber | Fraction | Complex | Unit | Array | Matrix | Number to be inverted. |

### Returns #

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

number | BigNumber | Fraction | Complex | Unit | Array | Matrix | Returns the value with inverted sign. |

## Examples #

```
math.unaryMinus(3.5); // returns -3.5
math.unaryMinus(-4.2); // returns 4.2
```