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<?php
namespace SMW\Tests\Benchmark;
/**
* @license GNU GPL v2+
* @since 2.1
*
* @author mwjames
*/
class Benchmarker {
/**
* @var array
*/
private $container = [];
/**
* @var boolean
*/
private $useAsSample = false;
/**
* @var integer
*/
private $roundFactor;
/**
* @since 2.1
*/
public function __construct( $roundFactor = 7 ) {
$this->roundFactor = $roundFactor;
}
/**
* @since 2.1
*/
public function clear() {
$this->container = [];
return $this;
}
/**
* @since 2.1
*
* @param boalean $state false when takling about the entire population;
* true when it is a sample (a selection from a population)
*/
public function useAsSample( $state = true ) {
$this->useAsSample = $state;
return $this;
}
/**
* @since 2.1
*
* @param integer $roundFactor
*/
public function roundBy( $roundFactor ) {
$this->roundFactor = $roundFactor;
return $this;
}
/**
* @since 2.1
*
* @param integer $point
* @param integer $decimals
*/
public function addBenchmarkPoint( $point, $decimals = 10 ) {
$this->container[] = number_format( $point, $decimals );
}
/**
* @since 2.1
*
* @param integer[] $poins
*/
public function addBenchmarkPoints( array $poins ) {
$this->container = $poins;
}
/**
* @since 2.1
*
* @return integer
*/
public function getSum() {
return $this->round( array_sum( $this->container ) );
}
/**
* @since 2.1
*
* @return integer
*/
public function getMean() {
return $this->round( $this->getSum() / count( $this->container ) );
}
/**
* @since 2.1
*
* @return integer
*/
public function getVariance() {
$mean = $this->getMean();
$count = count( $this->container );
$sumOfSquares = 0;
foreach ( $this->container as $value ) {
$sumOfSquares += pow( $value - $mean, 2 );
}
return $sumOfSquares / ( $this->useAsSample ? $count - 1 : $count );
}
/**
* @since 2.1
*
* @return integer
*/
public function getStandardDeviation() {
return $this->round( (float)sqrt( $this->getVariance() ) );
}
/**
* @since 2.1
*
* @param integer $basis
*
* @return integer
*/
public function getStandardScoreBy( $basis = 0 ) {
return $this->round( ( $basis - $this->getMean() ) / $this->getStandardDeviation() );
}
/**
* @since 2.1
*
* @param integer $basis
*
* @return integer
*/
public function getNormalizedValueBy( $basis = 1 ) {
return $this->round( $this->getMean() / $basis );
}
private function round( $value ) {
return round( $value, $this->roundFactor );
}
}
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