PHP 5.6.0 released

stats_harmonic_mean

(PECL stats >= 1.0.0)

stats_harmonic_meanRetourne la moyenne harmonique d'un tableau de valeurs

Description

number stats_harmonic_mean ( array $a )
Avertissement

Cette fonction n'est pas documentée et seule la liste des arguments est disponible.

Liste de paramètres

a

Valeurs de retour

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User Contributed Notes 1 note

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2
Daniel Morris (www.danielxmorris.com)
6 years ago
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 

?>
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