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stats_harmonic_mean

(PECL stats >= 1.0.0)

stats_harmonic_meanDevuelve la media armónica de una matriz de valores

Descripción

number stats_harmonic_mean ( array $a )
Advertencia

Esta función no está documentada actualmente, solamente se encuentra disponible la lista de parámetros.

Parámetros

a

Valores devueltos

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User Contributed Notes 1 note

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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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