JavaScript tanh

Returns the hyperbolic tangent of the number, defined as sinh(number)/cosh(number)

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function tanh (arg) {
    // Returns the hyperbolic tangent of the number, defined as sinh(number)/cosh(number)  
    // 
    // version: 1109.2015
    // discuss at: http://phpjs.org/functions/tanh    // +   original by: Onno Marsman
    // *     example 1: tanh(5.4251848798444815);
    // *     returns 1: 0.9999612058841574
    return (Math.exp(arg) - Math.exp(-arg)) / (Math.exp(arg) + Math.exp(-arg));
}

Examples

Running

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tanh(5.4251848798444815);

Should return

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0.9999612058841574

Dependencies

No dependencies, you can use this function standalone.

Open syntax issues

php.js uses JsLint to help us keep our code consistent and prevent some common bugs.

Eventually we want all code to pass or at least take into consideration most fixes suggested by JsLint, following this JsLint configuration we’ve decided on.

Authors

Thanks to the following developers, you get to have tanh goodness in JavaScript.

• Onno Marsman ( original )

Comments

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By submitting code here you are allowing us to use it in php.js hence dual licensing it under the MIT and GPL licenses

Robert Eisele
3 Sep '11

  I optimized the function in order to perform much faster than the original:

function tanh(x) {

	var t = Math.exp(2 * x);
	return (t - 1) / (t + 1);
}

Brett Zamir
28 May '11

  @Ian: Would you mind clarifying how or why? I don't see anything wrong with this function that would cause compilation problems if that's what you mean. Anyways, the site lets you make your own package...

Ian
27 May '11

  it darn crashes the fucking rest of most javascript finctions

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