mathjs/docs/reference/functions/not.md

Function not

Logical not. Flips boolean value of a given parameter. For matrices, the function is evaluated element wise.

Syntax

math.not(x)

Parameters

Parameter	Type	Description
x	Number | BigNumber | Boolean | Complex | Unit | Array | Matrix | null	First value to check

Returns

Type	Description
Boolean | Array | Matrix	Returns true when input is a zero or empty value.

Examples

math.not(2);      // returns false
math.not(0);      // returns true
math.not(true);   // returns false

a = [2, -7, 0];
math.not(a);      // returns [false, false, true]

See also

and, or, xor