Php array Looping and calculate the average

Question

I want to calculate the average of all the values of array based on key. i have an array like this

$res_arr = 
array 
{
array[0]=>array
{
    [0] => 3
            [1] => 7
            [2] => 9
            [3] =>3
            [4] => 22
}
array[1]=>array
{
    [0] => 5
            [1] => 5
            [2] => 8
            [3] => 9
            [4] => 0
}
array[2]=>array
{
    [0] => 10
            [1] => 5
            [2] => 8
            [3] => 7
            [4] => 3
}
....
....
....
....
array[100]
}

There are totally 5 elements in each array

it should return an array with average calculated as

$av_array = ();
$array  = array(6,5.6,8.3,6.3,8.3)

Below is the loop i used

foreach($res_arr as $m=>$val)
{
    //echo $val[0];
    $return[$val[$m]][] = $val;
    //$cnt++;

}

What problem you face in above loop?

Rikesh
– Rikesh

2014-02-04 09:22:18 +00:00
Commented Feb 4, 2014 at 9:22 — Rikesh
– Rikesh, Commented Feb 4, 2014 at 9:22

vee · Accepted Answer · 2014-02-04 09:44:39Z

4

Using array_map and array_sum:

function array_average($arr)
{
  return array_sum($arr)/count($arr);
}

$array = array_map("array_average", $input_array);
print_r($array);

Update: Alternative syntax:

$array_average = function($arr) {
    return array_sum($arr)/count($arr);
};
$array = array_map($array_average, $input_array);
print_r($array);

edited Feb 4, 2014 at 9:44

answered Feb 4, 2014 at 9:23

vee

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2 Comments

Class Over a year ago

Should $array_average be "array_average"?

vee Over a year ago

@Class, yes, thanks for catching that, corrected answer.

user1864610 · Accepted Answer · 2014-02-04 09:23:44Z

0

Try this:

$av_array = [];
foreach($res_arr as $val)
{
    $av_array[] = array_sum($val)/count($val);
}
var_dump($av_array);

answered Feb 4, 2014 at 9:23

user1864610

Comments

Shankar Narayana Damodaran · Accepted Answer · 2014-02-04 09:24:34Z

0

Do this way..

foreach($arr as $arr1)
    {
        foreach($arr1 as $k=>$v)
        {
            $sum_arr[]=$v;
        }
        echo $avg = array_sum($sum_arr)/count($sum_arr);
        unset($sum_arr);
    }
}

answered Feb 4, 2014 at 9:24

Shankar Narayana Damodaran

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2 Comments

mark rammmy Over a year ago

No thats wrong ,it should returm single array like this $array = array(6,5.6,8.3,6.3,8.3) 3+5+10/3 = 6.5 Ele,emt by element

Shankar Narayana Damodaran Over a year ago

Like what ? Do you want the averages in an array or you want it as an output ?

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