Math.atan()
The Math.atan()
function returns the arctangent (in
radians) of a number, that is
Syntax
Math.atan(x)
Parameters
x
-
A number.
Return value
The arctangent (in radians) of the given number.
Description
The Math.atan()
method returns a numeric value between
and
radians.
Because atan()
is a static method of Math
, you always use it
as Math.atan()
, rather than as a method of a Math
object you
created (Math
is not a constructor).
Examples
Using Math.atan()
Math.atan(1); // 0.7853981633974483
Math.atan(0); // 0
Math.atan(-0); // -0
Math.atan(Infinity); // 1.5707963267948966
Math.atan(-Infinity); // -1.5707963267948966
// The angle that the line [(0,0);(x,y)] forms with the x-axis in a Cartesian coordinate system
Math.atan(y / x);
Note that you may want to avoid using ±Infinity
for
stylistic reasons. In this case, Math.atan2()
with 0
as the
second argument may be a better solution.
Specifications
Specification |
---|
ECMAScript Language Specification # sec-math.atan |
Browser compatibility
BCD tables only load in the browser