pow() public static méthode

Map raise to a power
public static pow ( array $xs, $n ) : array
$xs array
Résultat array
Single Class Documentation
Exemple #1
0
 /**
  * Calculate the regression parameters by least squares on linearized data
  * y⁻¹ = K * V⁻¹ * x⁻¹ + V⁻¹
  */
 public function calculate()
 {
     // Linearize the relationship by taking the inverse of both x and y
     $x’ = Single::pow($this->xs, -1);
     $y’ = Single::pow($this->ys, -1);
     // Perform Least Squares Fit
     $linearized_parameters = $this->leastSquares($y’, $x’)->getColumn(0);
     // Translate the linearized parameters back.
     $V = 1 / $linearized_parameters[0];
     $K = $linearized_parameters[1] * $V;
     $this->parameters = [$V, $K];
 }
Exemple #2
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 /**
  * p-norm (|x|p)
  * Also known as lp norm
  *
  * https://en.wikipedia.org/wiki/Norm_(mathematics)#p-norm
  *
  * |x|p = (∑|xᵢ|ᵖ)¹/ᵖ
  *
  * @return number
  */
 public function pNorm($p)
 {
     return array_sum(Map\Single::pow($this->A, $p)) ** (1 / $p);
 }