I need help with creating a script that mixs up numbers togethier.

This is kind of hard to explain.

For example the list: 1 99 67 34 23

I would like a script that could take a string of space separated numbers that could be any amount and any numbers inputed and then pair them up with each other, but not itself.

Output would be like
1 99
1 67
1 34
1 23
99 1
99 67
99 34
99 23
67 1
and so forth.

The problem I am having is I can't come up with the formula to take a dynamic set of numbers to pair them up with each other. The above is 5 numbers, but users might enter 3 numbers even up to ten numbers.

Is it really easy and I am just over looking something?

I was thinking about using a for loop with a array shift and an array push to be able to do it, but i get stuck thinking about it. I know the number it would produce is the number of numbers times itself and I might should setup the for loop with that number.

Please, help me figure this out, thanks!

*No this is not a homework assignment.

 

Is this a probability formula you are looking for?

 

This can be done with a loop inside a loop

function MakePairs($num_array) {
    $pairs = array();
    foreach($num_array as $outer) {
        foreach($num_array as $inner) {
            if($outer != $inner)
                $pairs[] = array($outer, $inner);
        }
    }
    
    return $pairs;
}

PHP:

 

Actually, it was quite easy

Steve

<?php

//Here is the input array of numbers:
$arrInput = Array(1, 91, 98, 90, 99, 20);
$arrOutput = Array();

$iIndex = 0;
for($i = 0; $i < count($arrInput); $i++)
{
	for($j = 0; $j < count($arrInput); $j++)
	{
		//if the numbers are the not same, add them in the matrix:
		if ($arrInput[$i] != $arrInput[$j])
		{
			$arrOutput[$iIndex][0] = $arrInput[$i];
			$arrOutput[$iIndex][1] = $arrInput[$j];
			$iIndex++;
		}
	}
}

print_r($arrOutput);
?>

PHP:

Here is the output for this example...

 

Thank you, i went was racking my brain last night looking for this.