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class PHPExcel_Exponential_Best_Fit in Loft Data Grids 6.2

Same name and namespace in other branches
  1. 7.2 vendor/phpoffice/phpexcel/Classes/PHPExcel/Shared/trend/exponentialBestFitClass.php \PHPExcel_Exponential_Best_Fit

PHPExcel_Exponential_Best_Fit

@category PHPExcel @package PHPExcel_Shared_Trend @copyright Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)

Hierarchy

Expanded class hierarchy of PHPExcel_Exponential_Best_Fit

File

vendor/phpoffice/phpexcel/Classes/PHPExcel/Shared/trend/exponentialBestFitClass.php, line 39

View source
class PHPExcel_Exponential_Best_Fit extends PHPExcel_Best_Fit {

  /**
   * Algorithm type to use for best-fit
   * (Name of this trend class)
   *
   * @var	string
   **/
  protected $_bestFitType = 'exponential';

  /**
   * Return the Y-Value for a specified value of X
   *
   * @param	 float		$xValue			X-Value
   * @return	 float						Y-Value
   **/
  public function getValueOfYForX($xValue) {
    return $this
      ->getIntersect() * pow($this
      ->getSlope(), $xValue - $this->_Xoffset);
  }

  //	function getValueOfYForX()

  /**
   * Return the X-Value for a specified value of Y
   *
   * @param	 float		$yValue			Y-Value
   * @return	 float						X-Value
   **/
  public function getValueOfXForY($yValue) {
    return log(($yValue + $this->_Yoffset) / $this
      ->getIntersect()) / log($this
      ->getSlope());
  }

  //	function getValueOfXForY()

  /**
   * Return the Equation of the best-fit line
   *
   * @param	 int		$dp		Number of places of decimal precision to display
   * @return	 string
   **/
  public function getEquation($dp = 0) {
    $slope = $this
      ->getSlope($dp);
    $intersect = $this
      ->getIntersect($dp);
    return 'Y = ' . $intersect . ' * ' . $slope . '^X';
  }

  //	function getEquation()

  /**
   * Return the Slope of the line
   *
   * @param	 int		$dp		Number of places of decimal precision to display
   * @return	 string
   **/
  public function getSlope($dp = 0) {
    if ($dp != 0) {
      return round(exp($this->_slope), $dp);
    }
    return exp($this->_slope);
  }

  //	function getSlope()

  /**
   * Return the Value of X where it intersects Y = 0
   *
   * @param	 int		$dp		Number of places of decimal precision to display
   * @return	 string
   **/
  public function getIntersect($dp = 0) {
    if ($dp != 0) {
      return round(exp($this->_intersect), $dp);
    }
    return exp($this->_intersect);
  }

  //	function getIntersect()

  /**
   * Execute the regression and calculate the goodness of fit for a set of X and Y data values
   *
   * @param	 float[]	$yValues	The set of Y-values for this regression
   * @param	 float[]	$xValues	The set of X-values for this regression
   * @param	 boolean	$const
   */
  private function _exponential_regression($yValues, $xValues, $const) {
    foreach ($yValues as &$value) {
      if ($value < 0.0) {
        $value = 0 - log(abs($value));
      }
      elseif ($value > 0.0) {
        $value = log($value);
      }
    }
    unset($value);
    $this
      ->_leastSquareFit($yValues, $xValues, $const);
  }

  //	function _exponential_regression()

  /**
   * Define the regression and calculate the goodness of fit for a set of X and Y data values
   *
   * @param	float[]		$yValues	The set of Y-values for this regression
   * @param	float[]		$xValues	The set of X-values for this regression
   * @param	boolean		$const
   */
  function __construct($yValues, $xValues = array(), $const = True) {
    if (parent::__construct($yValues, $xValues) !== False) {
      $this
        ->_exponential_regression($yValues, $xValues, $const);
    }
  }

}

Members

Namesort descending Modifiers Type Description Overrides
PHPExcel_Best_Fit::$_adjustToZero protected property * Flag indicating whether values should be adjusted to Y=0 * * *
PHPExcel_Best_Fit::$_correlation protected property
PHPExcel_Best_Fit::$_covariance protected property
PHPExcel_Best_Fit::$_DFResiduals protected property
PHPExcel_Best_Fit::$_error protected property * Indicator flag for a calculation error * * *
PHPExcel_Best_Fit::$_F protected property
PHPExcel_Best_Fit::$_goodnessOfFit protected property
PHPExcel_Best_Fit::$_intersect protected property
PHPExcel_Best_Fit::$_intersectSE protected property
PHPExcel_Best_Fit::$_slope protected property
PHPExcel_Best_Fit::$_slopeSE protected property
PHPExcel_Best_Fit::$_SSRegression protected property
PHPExcel_Best_Fit::$_SSResiduals protected property
PHPExcel_Best_Fit::$_stdevOfResiduals protected property
PHPExcel_Best_Fit::$_valueCount protected property * Number of entries in the sets of x- and y-value arrays * * *
PHPExcel_Best_Fit::$_Xoffset protected property
PHPExcel_Best_Fit::$_xValues protected property * X-value dataseries of values * * *
PHPExcel_Best_Fit::$_yBestFitValues protected property * Y-value series of best-fit values * * *
PHPExcel_Best_Fit::$_Yoffset protected property
PHPExcel_Best_Fit::$_yValues protected property * Y-value dataseries of values * * *
PHPExcel_Best_Fit::getBestFitType public function
PHPExcel_Best_Fit::getCorrelation public function
PHPExcel_Best_Fit::getCovariance public function
PHPExcel_Best_Fit::getDFResiduals public function
PHPExcel_Best_Fit::getError public function
PHPExcel_Best_Fit::getF public function
PHPExcel_Best_Fit::getGoodnessOfFit public function * Return the goodness of fit for this regression * *
PHPExcel_Best_Fit::getGoodnessOfFitPercent public function
PHPExcel_Best_Fit::getIntersectSE public function * Return the standard error of the Intersect * *
PHPExcel_Best_Fit::getSlopeSE public function * Return the standard error of the Slope * *
PHPExcel_Best_Fit::getSSRegression public function
PHPExcel_Best_Fit::getSSResiduals public function
PHPExcel_Best_Fit::getStdevOfResiduals public function * Return the standard deviation of the residuals for this regression * *
PHPExcel_Best_Fit::getXValues public function * Return the original set of X-Values * *
PHPExcel_Best_Fit::getYBestFitValues public function
PHPExcel_Best_Fit::_calculateGoodnessOfFit protected function
PHPExcel_Best_Fit::_leastSquareFit protected function
PHPExcel_Exponential_Best_Fit::$_bestFitType protected property * Algorithm type to use for best-fit * (Name of this trend class) * * * Overrides PHPExcel_Best_Fit::$_bestFitType
PHPExcel_Exponential_Best_Fit::getEquation public function * Return the Equation of the best-fit line * * Overrides PHPExcel_Best_Fit::getEquation
PHPExcel_Exponential_Best_Fit::getIntersect public function * Return the Value of X where it intersects Y = 0 * * Overrides PHPExcel_Best_Fit::getIntersect
PHPExcel_Exponential_Best_Fit::getSlope public function * Return the Slope of the line * * Overrides PHPExcel_Best_Fit::getSlope
PHPExcel_Exponential_Best_Fit::getValueOfXForY public function * Return the X-Value for a specified value of Y * * Overrides PHPExcel_Best_Fit::getValueOfXForY
PHPExcel_Exponential_Best_Fit::getValueOfYForX public function * Return the Y-Value for a specified value of X * * Overrides PHPExcel_Best_Fit::getValueOfYForX
PHPExcel_Exponential_Best_Fit::_exponential_regression private function * Execute the regression and calculate the goodness of fit for a set of X and Y data values * *
PHPExcel_Exponential_Best_Fit::__construct function * Define the regression and calculate the goodness of fit for a set of X and Y data values * * Overrides PHPExcel_Best_Fit::__construct