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stats_kurtosis> <stats_dens_weibull
[edit] Last updated: Fri, 25 May 2012

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stats_harmonic_mean

(PECL stats >= 1.0.0)

stats_harmonic_meanReturns the harmonic mean of an array of values

Descrierea

number stats_harmonic_mean ( array $a )
Avertizare

Această funcție nu este documentată în prezent; este disponibilă numai lista sa de argumente.

Parametri

a

Valorile întoarse



add a note add a note User Contributed Notes stats_harmonic_mean
Daniel Morris (www.danielxmorris.com) 15-Aug-2008 01:51
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 

?>

 
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