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Minor performance boost

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This commit is contained in:
Jens True
2024-03-19 12:49:14 +00:00
parent 7b09658c25
commit fd91e9b0c1
2 changed files with 47 additions and 40 deletions
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17
src/Numerics/GaussianDistribution.php
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@ -12,6 +12,8 @@ namespace DNW\Skills\Numerics;
*/
class GaussianDistribution implements \Stringable
{
private const DEFAULT_STANDARD_DEVIATION = 1.0;
private const DEFAULT_MEAN = 0.0;
/**
* Square Root 2π.
* Precalculated constant for performance reasons
@ -32,16 +34,21 @@ class GaussianDistribution implements \Stringable
// precision and precisionMean are used because they make multiplying and dividing simpler
// (the the accompanying math paper for more details)
private float $precision;
private float $precision = 1.0;
private float $precisionMean;
private float $precisionMean = 0.0;
private float $variance;
private float $variance = 1.0;
public function __construct(private float $mean = 0.0, private float $standardDeviation = 1.0)
public function __construct(private float $mean = self::DEFAULT_MEAN, private float $standardDeviation = self::DEFAULT_STANDARD_DEVIATION)
{
$this->variance = BasicMath::square($standardDeviation);
if($mean == self::DEFAULT_MEAN && $standardDeviation == self::DEFAULT_STANDARD_DEVIATION)
{
//Use all the defaults
return;
}
$this->variance = BasicMath::square($standardDeviation);
if ($this->variance != 0) {
$this->precision = 1.0 / $this->variance;
$this->precisionMean = $this->precision * $this->mean;