Math.atanh()
The Math.atanh()
function returns the hyperbolic arctangent of a number, that is
Syntax
JavaScript
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Math.atanh(<var>x</var>)
Parameters
x
- A number.
Return value
The hyperbolic arctangent of the given number.
Description
Because atanh()
is a static method of Math
, you always use it as Math.atanh()
, rather than as a method of a Math
object you created (Math
is not a constructor).
Examples
Using Math.atanh()
JavaScript
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Math.atanh(-2); // NaN Math.atanh(-1); // -Infinity Math.atanh(0); // 0 Math.atanh(0.5); // 0.5493061443340548 Math.atanh(1); // Infinity Math.atanh(2); // NaN
For values greater than 1 or less than -1, NaN
is returned.
Polyfill
For , we have so this can be emulated by the following function:
JavaScript
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Math.atanh = Math.atanh || function(x) { return Math.log((1+x)/(1-x)) / 2; };
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Math.atanh' in that specification. |
Standard | Initial definition. |
ECMAScript 2017 Draft (ECMA-262) The definition of 'Math.atanh' in that specification. |
Draft |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | 38 | 25 (25) | No support | 25 | 7.1 |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | No support | No support | 25.0 (25) | No support | No support | 8 |
See also
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/javascript/reference/global_objects/math/atanh