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Inverse hyperbolic sine
(PHP 4 >= 4.0.7, PHP 5)
Code Examples / Notes » asinharakrys
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.
snoyes
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)))); } } |
