asin
When using snoyes alternative bcasinh function, don't forget to check the precision of each single bcfunction or the default precision of ini setting bcmath.scale.
asinh
(PHP 4 >= 4.1.0, PHP 5)
asinh — Areasinus Hyperbolikus
Beschreibung
float asinh
( float $arg
)
Berechnet den Areasinus Hyperbolikus von arg. Der Areasinus Hyperbolikus ist die Umkehrfunktion des Sinus Hyperbolikus, d.h. asinh(sinh(arg)) = arg.
Parameter-Liste
- arg
-
Der zu verarbeitende Wert
Rückgabewerte
Der Areasinus Hyperbolikus von arg
Changelog
| Version | Beschreibung |
|---|---|
| 5.3.0 | Die Funktion ist nun auf allen Plattformen verfügbar. |
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User Contributed Notesasinh
Arakrys
08-Jun-2007 09:57
08-Jun-2007 09:57
snoyes at gmail dot com
27-Dec-2005 04:42
27-Dec-2005 04:42
asinh for windows:
The definition for asinh is asinh(z) = log(z + sqrt(z^2 + 1))
The built-in math functions and operators give poor results for small values of z. The BCMath version produces closer results, but still quite distant if z < 1. A BCMath version of the log function might help.
if (!function_exists("asinh")) {
function asinh($z) {
return log($z + sqrt($z^2 +1));
}
}
if (!function_exists("bcasinh")) {
function bcasinh($z) {
return log(bcadd($z, bcsqrt(bcadd(bcpow($z, 2), 1))));
}
}