Math.atanh()
The Math.atanh()
function returns the hyperbolic
arctangent of a number, that is
Syntax
Math.atanh(x)
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()
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:
Math.atanh = Math.atanh || function(x) {
return Math.log((1+x)/(1-x)) / 2;
};
Specifications
Specification |
---|
ECMAScript Language Specification # sec-math.atanh |
Browser compatibility
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