# Function round #

Round a value towards the nearest rounded value. For matrices, the function is evaluated element wise.

## Syntax #

``````math.round(x)
math.round(x, n)
math.round(unit, valuelessUnit)
math.round(unit, n, valuelessUnit)
``````

### Parameters #

Parameter Type Description
`x` number | BigNumber | Fraction | Complex | Unit | Array | Matrix Value to be rounded
`n` number | BigNumber | Array Number of decimals Default value: 0.
`valuelessUnit` Unit A valueless unit

### Returns #

Type Description
number | BigNumber | Fraction | Complex | Array | Matrix Rounded value

### Throws #

Type | Description —- | ———–

## Examples #

``````math.round(3.22)             // returns number 3
math.round(3.82)             // returns number 4
math.round(-4.2)             // returns number -4
math.round(-4.7)             // returns number -5
math.round(3.22, 1)          // returns number 3.2
math.round(3.88, 1)          // returns number 3.9
math.round(-4.21, 1)         // returns number -4.2
math.round(-4.71, 1)         // returns number -4.7
math.round(math.pi, 3)       // returns number 3.142
math.round(123.45678, 2)     // returns number 123.46

const c = math.complex(3.2, -2.7)
math.round(c)                // returns Complex 3 - 3i

const unit = math.unit('3.241 cm')
const cm = math.unit('cm')
const mm = math.unit('mm')
math.round(unit, 1, cm)      // returns Unit 3.2 cm
math.round(unit, 1, mm)      // returns Unit 32.4 mm

math.round([3.2, 3.8, -4.7]) // returns Array [3, 4, -5]
``````