Calcula average of connected numbers in array

[dpthuy]

Example :
I have a array: $arr = array(1,5,8,9,5,8,7)

Now, I need to print a new array with value of array as:

$new_arr = array (1, (5+1)/2 , (8+5+1)/3 , (9+8+5)/3 ,(5+9+8)/3 , (8+5+9)/3 ,(7+8+5)/3).

I need to write a function with parameter input are a array, and number as 3, and output is a new array with values are calculated as formula I demonstrated above.

Anyone have idea please help me !
Thank you.

[laserlight]

You actually provided an example rather than a formula, but anyway, it looks like you need to use a loop. What have you tried?

[dpthuy]

I tried , but I need to extend the function with two parameters input like this: function avg($arr, numberOf)
With numberOf is 3 or 5 or 9 or ...
Please give me ideas
Thank you,

function avg($arr)
{
for($i=0; $i<count($arr) ;$i++)
{
if($i==0)
{
$arr[0] = $arr[0];
}

        if($i==1)
        {
            $arr[1] = ($arr[1] + $arr[0])/2;
        }

        if($i>=2)
        {
            $arr[$i] = ($arr[$i]+$arr[$i-1]+$arr[$i-2])/3;
        }
    }
    return $arr;
}

[laserlight]

I suggest that you do something like this:

<?php
function connectedAverage($numbers, $n)
{
    $result = array();
    $count = count($numbers);

// Handle the cases of 1 term, 2 terms, ..., $n - 1 terms.
// ...

// Handle the cases where there are exactly $n terms.
// ...

return $result;
}

Note that you would likely need to use nested for loops (or at least that is how I did it).