mathjs/docs/reference/functions/round.md

Function round

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

Syntax

math.round(x)
math.round(x, n)

Parameters

Parameter	Type	Description
x	number | BigNumber | Fraction | Complex | Array | Matrix	Number to be rounded
n	number | BigNumber | Array	Number of decimals Default value: 0.

Returns

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

Examples

math.round(3.2)              // returns number 3
math.round(3.8)              // returns number 4
math.round(-4.2)             // returns number -4
math.round(-4.7)             // returns number -5
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

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

See also

ceil, fix, floor