Exemplo n.º 1
1
function GenerateGroup($ingroup, $boys, $girls)
{
    $minboys = 2;
    $mingirls = 1;
    $output = 0;
    if ($boys < 4 || $girls < 1) {
        $output = 0;
    } else {
        $pos_combinations = BoysGirlsPossibleCombinations($ingroup, $minboys, $mingirls, $boys, $girls);
        PrintArray($pos_combinations);
        $sum = 0;
        foreach ($pos_combinations as $combination) {
            $set_combi = nCr($boys, $combination['boy']) * nCr($girls, $combination['girl']);
            $sum += $set_combi;
            //echo '$sum: '.$sum;
            //echo "nCr($boys,".$combination['boy'].")*nCr($girls,".$combination['girl'].")<br/>";
        }
        $output = $sum;
    }
    return $output;
}
Exemplo n.º 2
0
function nCr($n, $r)
{
    if ($r > $n) {
        return NaN;
    }
    if ($n - $r < $r) {
        return nCr($n, $n - $r);
    }
    $return = 1;
    for ($i = 0; $i < $r; $i++) {
        $return *= ($n - $i) / ($i + 1);
    }
    return $return;
}
Exemplo n.º 3
0
function binomialpdf($N, $p, $x)
{
    return nCr($N, $x) * pow($p, $x) * pow(1 - $p, $N - $x);
}