将数字按降序随机分配到多个点

Question

I need to distribute a number for multiple points in degraded order.

For example,

N = 100 // this 100 is fixed
no_of_points = 10 // no of points will vary 

Need to break 100 into 10 points in descending order RANDOMLY .

eg:

80, 55, 32, 18, 10, 10, 10, 8, 2, 0

Here,

1. degradation will be faster towards end
2. Must contain a zero to end

I'm trying to do something like:

private static function generateRandomPercentage($no_of_points)
{
    $distributions = [];

    // need to start from 80
    // but it may vary also

    $max = mt_rand(80, 81);
    $ratio = $max / $no_of_points;

    for( $i = 1; $i <= $no_of_points; $i++ ) {
        $delta = ($ratio * $i);
        $distributions[] = round(($max - $delta) / 100, 2);
    }

    print_r($distributions);
}

But nothing working. Please help me.

Answer 1

Can be done with php standard functions:

$N = 100 // this 100 is fixed
$no_of_points = 10 // no of points will vary

$distributions= rsort(array_slice(shuffle(range(1,$N)), 0, $no_of_points);
print_r($distributions));

range = create array with values 1...n

shuffle = shuffle array

array_slice = return part of an array

rsort = sort array values hight to low values