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PHP Statistics::stdev方法代码示例

本文整理汇总了PHP中Statistics::stdev方法的典型用法代码示例。如果您正苦于以下问题:PHP Statistics::stdev方法的具体用法?PHP Statistics::stdev怎么用?PHP Statistics::stdev使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在Statistics的用法示例。


在下文中一共展示了Statistics::stdev方法的2个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的PHP代码示例。

示例1: __construct

 public function __construct(array $samples, array $stats = [])
 {
     if (count($samples) < 1) {
         throw new \LogicException('Cannot create a distribution with zero samples.');
     }
     $this->samples = $samples;
     $this->closures = ['min' => function () {
         return min($this->samples);
     }, 'max' => function () {
         return max($this->samples);
     }, 'sum' => function () {
         return array_sum($this->samples);
     }, 'stdev' => function () {
         return Statistics::stdev($this->samples);
     }, 'mean' => function () {
         return Statistics::mean($this->samples);
     }, 'mode' => function () {
         return Statistics::kdeMode($this->samples);
     }, 'variance' => function () {
         return Statistics::variance($this->samples);
     }, 'rstdev' => function () {
         $mean = $this->getMean();
         return $mean ? $this->getStdev() / $mean * 100 : 0;
     }];
     if ($diff = array_diff(array_keys($stats), array_keys($this->closures))) {
         throw new \RuntimeException(sprintf('Unknown pre-computed stat(s) encountered: "%s"', implode('", "', $diff)));
     }
     $this->stats = $stats;
 }
开发者ID:dantleech,项目名称:phpbench,代码行数:29,代码来源:Distribution.php

示例2: computeCovariance

 /**
  * Computes the covariance matrix for each Gaussian kernel using
  * coVarianceFactor().
  */
 private function computeCovariance()
 {
     $factorCallable = $this->coVarianceFactor;
     $this->factor = $factorCallable();
     // Cache covariance and inverse covariance of the data
     if (null === $this->_dataInvCov) {
         // original used the numpy.cov function.
         $this->_dataCovariance = pow(Statistics::stdev($this->dataset, true), 2);
         //$this->_dataInvCov = 1/ linalg.inv($this->_dataCovariance)
         $this->_dataInvCov = 1 / $this->_dataCovariance;
     }
     $this->covariance = $this->_dataCovariance * pow($this->factor, 2);
     $this->invCov = $this->_dataInvCov / pow($this->factor, 2);
     $this->normFactor = sqrt(2 * M_PI * $this->covariance) * count($this->dataset);
 }
开发者ID:dantleech,项目名称:phpbench,代码行数:19,代码来源:Kde.php


注:本文中的Statistics::stdev方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。