mathjs/docs/reference/functions/sign.md

Function sign

Compute the sign of a value. The sign of a value x is:

• 1 when x > 1
• -1 when x < 0
• 0 when x == 0

For matrices, the function is evaluated element wise.

Syntax

math.sign(x)

Parameters

Parameter	Type	Description
x	Number | BigNumber | Boolean | Complex | Array | Matrix | null	The number for which to determine the sign

Returns

Type	Description
Number | BigNumber | Complex | Array | Matrix	e The sign of x

Examples

math.sign(3.5);               // returns 1
math.sign(-4.2);              // returns -1
math.sign(0);                 // returns 0

math.sign([3, 5, -2, 0, 2]);  // returns [1, 1, -1, 0, 1]

See also

abs