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Pulled out square function

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Dennis Eichhorn 2018-02-23 10:35:16 +01:00 committed by GitHub
parent 3f438238e7
commit a1b78de312
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1 changed files with 3 additions and 24 deletions
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27
Math/Statistic/Forecast/Error.php
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@ -125,7 +125,7 @@ class Error
*/ */
public static function getMeanSquaredError(array $errors) : float public static function getMeanSquaredError(array $errors) : float
{ {
return Average::arithmeticMean(self::square($errors)); return Average::arithmeticMean(Functions::powerInt($errors, 2));
} }
/** /**
@ -139,7 +139,7 @@ class Error
*/ */
public static function getRootMeanSquaredError(array $errors) : float public static function getRootMeanSquaredError(array $errors) : float
{ {
return sqrt(Average::arithmeticMean(self::square($errors))); return sqrt(Average::arithmeticMean(Functions::powerInt($errors, 2)));
} }
/** /**
@ -297,27 +297,6 @@ class Error
return Average::arithmeticMean($error); return Average::arithmeticMean($error);
} }
/**
* Square all values in array.
*
* @param array $values Values to square
*
* @return array
*
* @since 1.0.0
* todo: move to utils?! implement sqrt for array as well... could be usefull for others (e.g. matrix)
*/
private static function square(array $values) : array
{
$squared = [];
foreach ($values as $value) {
$squared[] = $value * $value;
}
return $squared;
}
/** /**
* Get cross sectional scaled errors (CSSE) * Get cross sectional scaled errors (CSSE)
* *
@ -387,7 +366,7 @@ class Error
*/ */
public static function getMeanSquaredScaledError(array $scaledErrors) : float public static function getMeanSquaredScaledError(array $scaledErrors) : float
{ {
return Average::arithmeticMean(self::square($scaledErrors)); return Average::arithmeticMean(Functions::powerInt($scaledErrors, 2));
} }
/** /**