/**
* Returns the moments of the distribution
*
* @param string $moments Which moments to compute. m for mean, v for variance, s for skew, k for kurtosis. Default 'mv'
* @return type array A dictionary containing the first four moments of the distribution
*/
public function stats($moments = 'mv')
{
return $this->calculator->getStats($moments, $this->lambda);
}
/**
* Returns a random float between $lambda and $lambda plus $k
*
* @param float $lambda The scale parameter. Default 1.0
* @param float $k The shape parameter. Default 1.0
* @return float The random variate.
*/
public function getRvs($lambda = 1, $k = 1)
{
$e = $this->exp->getRvs(1);
return $e == 0 ? 0 : $lambda * pow($e, 1 / $k);
}