stats_harmonic_mean

(PECL stats >= 1.0.0)

stats_harmonic_mean — Returns the harmonic mean of an array of values

说明

number stats_harmonic_mean ( array $a )

Warning

本函数还未编写文档，仅有参数列表。

参数

a

返回值

PHP手册 - N: Returns the harmonic mean of an array of values

用户评论:

Daniel Morris (www.danielxmorris.com) (15-Aug-2008 03:51)

I wrote this to calculate harmonic averages in my shares program. Hopefully this can help someone who doesn't want to use PECL. The function accepts an unlimited number of arguments without the need to place them into an array, which is better than the way the PECL extension handles the function. <?php /** * @author Daniel Morris */ function harmonic () { $num_args = func_num_args (); for ($i = 0; $i < $num_args; $i++) { $sum += 1 / func_get_arg ($i); } return $num_args / $sum; } // Tests echo harmonic (1, 2, 3, 4, 5); echo harmonic (-1, 3, 4, 10293); echo harmonic (-1, -2, -3, -4, -5); // 2.1897810218978 // -9.6022389365052 // -2.1897810218978 ?>