mathjs/docs/reference/functions/atan2.md

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§Function atan2

Calculate the inverse tangent function with two arguments, y/x. By providing two arguments, the right quadrant of the computed angle can be determined.

For matrices, the function is evaluated element wise.

§Syntax

math.atan2(y, x)

§Parameters

Parameter	Type	Description
y	Number | Boolean | Complex | Array | Matrix	Second dimension
x	Number | Boolean | Complex | Array | Matrix	First dimension

§Returns

Type	Description
Number | Complex | Array | Matrix	Four-quadrant inverse tangent

§Examples

math.atan2(2, 2) / math.pi;       // returns number 0.25

var angle = math.unit(60, 'deg'); // returns Unit 60 deg
var x = math.cos(angle);
var y = math.sin(angle);

math.atan(2);             // returns Complex 1.5707963267948966 -1.3169578969248166 i

§See also

tan, atan, sin, cos