public function __construct($shape, $scale, GeneratorInterface $rnd = null)
{
parent::__construct($rnd);
$this->scale = $scale;
$this->shape = abs($shape);
if ($this->shape >= 1) {
$this->normal = new Normal(0, 1, $this->rnd);
} else {
$this->gamma = new Gamma($this->shape + 1, 1, $this->rnd);
}
}
public function __construct($a, $k, GeneratorI $rnd = null)
{
parent::__construct($rnd);
$k = (int) abs($k);
if (!is_array($a)) {
$a = array_fill_keys(range(0, $k - 1), $a);
}
$rnd = $this->rnd;
$this->gamma = array_map(function ($a) use($rnd) {
return new Gamma($a, 1, $rnd);
}, $a);
}
public function __construct($m = 0.0, $sigma = 1.0, GeneratorInterface $rnd = null)
{
parent::__construct($rnd);
$this->m = $m;
$this->sigma = abs($sigma);
}