/**
* Get coefficients.
*
* Calculate and return coefficients based on current data.
* @param int $numberOfCoefficient Ignored.
* @return array Array of coefficients (as BC strings).
*/
public function getCoefficients($numberOfCoefficient = -1)
{
$result = parent::getCoefficients(2);
$result[0] = exp($result[0]);
return $result;
}
/**
* Add data.
*
* Add a data point to calculation.
* @param float $x Some real value.
* @param float $y Some real value corresponding to $x.
*/
public function addData($x, $y)
{
// Take the natural log of x before adding this data.
$x = log($x);
parent::addData($x, $y);
}
