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 | Boolean | Complex | Array | Matrix | null	Number to be rounded
n	Number | BigNumber | Boolean | Array | null	Number of decimals Default value: 0.

Returns

Type	Description
Number | BigNumber | 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

var 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