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stats_harmonic_mean

(PECL stats >= 1.0.0)

stats_harmonic_meanRenvoie la moyenne harmonique d'un tableau de valeurs

Description

stats_harmonic_mean(array $a): number

Renvoie la moyenne harmonique des valeurs de a.

Liste de paramètres

a

Le tableau d'entrée

Valeurs de retour

Renvoie la moyenne harmonique des valeurs de a, ou false si a est vide ou n'est pas un tableau.

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User Contributed Notes 1 note

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4
Daniel Morris (www.danielxmorris.com)
16 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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