PHP PhpBench\Math Statistics::histogram示例

histogram() public static method

Note this is not a great function, and should not be relied upon for serious use. For a better implementation copy: http://docs.scipy.org/doc/numpy-1.10.1/reference/generated/numpy.histogram.html

public static histogram ( array $values, integer $steps = 10, float $lowerBound = null, float $upperBound = null ) : array
$values	array
$steps	integer
$lowerBound	float
$upperBound	float
return	array

示例#1

文件： HistogramGenerator.php 项目： lmaslowski/phpbench

    public function generate(SuiteDocument $results, Config $config)
    {
        $document = new Document();
        $reportEl = $document->createRoot('reports');
        $reportEl->setAttribute('name', $config->getName());
        $reportEl = $reportEl->appendElement('report');
        $descriptionEl = $reportEl->appendElement('description');
        $descriptionEl->nodeValue = <<<EOT
Warning: The histogram report is experimental, it may change or be removed without warning in
future versions of PHPBench.
EOT;
        $tableEl = $reportEl->appendElement('table');
        foreach ($results->query('//subject') as $subjectEl) {
            foreach ($subjectEl->query('.//variant') as $variantEl) {
                $times = array();
                foreach ($variantEl->query('.//iteration') as $iterationEl) {
                    $times[] = $iterationEl->getAttribute('rev-time');
                }
                if (count($times) > 1) {
                    $histogram = Statistics::histogram($times, $config['bins']);
                    $kde = new Kde($times);
                    $kdeX = Statistics::linspace(min($times), max($times), $config['bins'] + 1);
                    $kdeY = $kde->evaluate($kdeX);
                } else {
                    $histogram = array((string) current($times) => 1);
                    $kdeY = array(null);
                }
                $counter = 0;
                foreach ($histogram as $xValue => $frequency) {
                    $kdeVal = $kdeY[$counter++];
                    $rowEl = $tableEl->appendElement('row');
                    $cellEl = $rowEl->appendElement('cell');
                    $cellEl->setAttribute('name', 'benchmark');
                    $cellEl->nodeValue = functions\class_name($subjectEl->evaluate('string(ancestor::benchmark/@class)'));
                    $cellEl = $rowEl->appendElement('cell');
                    $cellEl->setAttribute('name', 'subject');
                    $cellEl->nodeValue = $subjectEl->evaluate('string(./@name)');
                    $cellEl = $rowEl->appendElement('cell');
                    $cellEl->setAttribute('name', 'index');
                    $cellEl->nodeValue = $counter;
                    $cellEl = $rowEl->appendElement('cell');
                    $cellEl->setAttribute('name', 'time');
                    $cellEl->nodeValue = $xValue;
                    $cellEl = $rowEl->appendElement('cell');
                    $cellEl->setAttribute('name', 'freq');
                    $cellEl->nodeValue = $frequency;
                    $cellEl = $rowEl->appendElement('cell');
                    $cellEl->setAttribute('name', 'kde');
                    $cellEl->nodeValue = $kdeVal;
                }
            }
        }
        return $document;
    }

示例#2

文件： StatisticsTest.php 项目： lmaslowski/phpbench

 /**
  * It should return histogram data.
  *
  * @dataProvider provideHistogram
  */
 public function testHistogram(array $data, $steps, $lower, $upper, array $expected)
 {
     $result = Statistics::histogram($data, $steps, $lower, $upper);
     $this->assertEquals($expected, $result);
 }

示例#3

文件： HistogramLogger.php 项目： dantleech/phpbench

 private function drawIterations(Variant $variant)
 {
     $subject = $variant->getSubject();
     $this->output->write("");
     // clear the whole line
     $this->output->write(PHP_EOL);
     $this->output->write("");
     // clear the whole line
     $this->output->write("");
     $sigma = 2;
     $bins = 16;
     if ($variant->isComputed()) {
         $times = $variant->getMetricValues(ComputedResult::class, 'z_value');
         $stats = $variant->getStats();
         $freqs = Statistics::histogram($times, $bins, -$sigma, $sigma);
     } else {
         $stats = new Distribution([0]);
         $freqs = array_fill(0, $bins + 1, null);
     }
     $this->output->write(sprintf('#%-2d (σ = %s ) -%sσ [', $subject->getIndex(), $this->timeUnit->format($stats->getStdev()), $sigma));
     $this->drawBlocks($freqs, $stats);
     $this->output->write(sprintf('] +%sσ <comment>%s</comment>', $sigma, $variant->isComputed() ? $this->formatIterationsShortSummary($variant) : ''));
     $this->output->write(PHP_EOL);
 }

示例#4

文件： HistogramLogger.php 项目： lmaslowski/phpbench

 private function drawIterations(IterationCollection $iterations)
 {
     $subject = $iterations->getSubject();
     $this->output->write("");
     // clear the whole line
     $this->output->write(PHP_EOL);
     $this->output->write("");
     // clear the whole line
     $this->output->write("");
     $sigma = 2;
     $bins = 16;
     if ($iterations->isComputed()) {
         $times = $iterations->getZValues();
         $stats = $iterations->getStats();
         $freqs = Statistics::histogram($times, $bins, -$sigma, $sigma);
     } else {
         $stats = array('stdev' => 0, 'mean' => 0, 'max' => 0);
         $freqs = array_fill(0, $bins + 1, null);
     }
     $this->output->write(sprintf('#%-2d (σ = %s ) -%sσ [', $subject->getIndex(), $this->timeUnit->format($stats['stdev']), $sigma));
     $this->drawBlocks($freqs, $stats);
     $this->output->write(sprintf('] +%sσ <comment>%s</comment>', $sigma, $iterations->isComputed() ? $this->formatIterationsShortSummary($iterations) : ''));
     $this->output->write(PHP_EOL);
 }