asinh

(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)

asinh — Inverse hyperbolic sine

Description

asinh(float $num): float

Returns the inverse hyperbolic sine of num, i.e. the value whose hyperbolic sine is num.

Parameters

num: The argument to process

Return Values

The inverse hyperbolic sine of num

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User Contributed Notes 2 notes

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ape_cwb at yahoo dot com dot br ¶

16 years ago

The correct implementation of asinh(x) for Windows plataform is:

-------------------------------------------------------
function asinh($x)
{
        return ln($x + sqrt(1 + pow($x, 2)));
}

function ln($x)
{
     return $x = log($x)/log(M_E);
}
--------------------------------------------------------

The worksheet above includes a comparation about the native asinh(x) and the implemented version using LN and LOG (like Snoyes posted on 27-Dec-2005 07:42) 

http://www.mavadesign.com.br/allan/asinh(x).xls

This implementation using LN, give THE SAME results that function asinh(x) linux native.

Allan Patrick Engel
Curitiba - Paraná - Brasil