Inheritance diagram for PHPExcel_Exponential_Best_Fit:

Collaboration diagram for PHPExcel_Exponential_Best_Fit:

Public Member Functions
	getValueOfYForX ($xValue)
	Return the Y-Value for a specified value of X. More...

	getValueOfXForY ($yValue)
	Return the X-Value for a specified value of Y. More...

	getEquation ($dp=0)
	Return the Equation of the best-fit line. More...

	getSlope ($dp=0)
	Return the Slope of the line. More...

	getIntersect ($dp=0)
	Return the Value of X where it intersects Y = 0. More...

	__construct ($yValues, $xValues=array(), $const=True)
	Define the regression and calculate the goodness of fit for a set of X and Y data values. More...

Public Member Functions inherited from PHPExcel_Best_Fit
	getError ()

	getBestFitType ()

	getValueOfYForX ($xValue)
	Return the Y-Value for a specified value of X. More...

	getValueOfXForY ($yValue)
	Return the X-Value for a specified value of Y. More...

	getXValues ()
	Return the original set of X-Values. More...

	getEquation ($dp=0)
	Return the Equation of the best-fit line. More...

	getSlope ($dp=0)
	Return the Slope of the line. More...

	getSlopeSE ($dp=0)
	Return the standard error of the Slope. More...

	getIntersect ($dp=0)
	Return the Value of X where it intersects Y = 0. More...

	getIntersectSE ($dp=0)
	Return the standard error of the Intersect. More...

	getGoodnessOfFit ($dp=0)
	Return the goodness of fit for this regression. More...

	getGoodnessOfFitPercent ($dp=0)

	getStdevOfResiduals ($dp=0)
	Return the standard deviation of the residuals for this regression. More...

	getSSRegression ($dp=0)

	getSSResiduals ($dp=0)

	getDFResiduals ($dp=0)

	getF ($dp=0)

	getCovariance ($dp=0)

	getCorrelation ($dp=0)

	getYBestFitValues ()

	__construct ($yValues, $xValues=array(), $const=True)
	Define the regression. More...

Protected Attributes
	$_bestFitType = 'exponential'

Protected Attributes inherited from PHPExcel_Best_Fit
	$_error = False

	$_bestFitType = 'undetermined'

	$_valueCount = 0

	$_xValues = array()

	$_yValues = array()

	$_adjustToZero = False

	$_yBestFitValues = array()

	$_goodnessOfFit = 1

	$_stdevOfResiduals = 0

	$_covariance = 0

	$_correlation = 0

	$_SSRegression = 0

	$_SSResiduals = 0

	$_DFResiduals = 0

	$_F = 0

	$_slope = 0

	$_slopeSE = 0

	$_intersect = 0

	$_intersectSE = 0

	$_Xoffset = 0

	$_Yoffset = 0

Private Member Functions
	_exponential_regression ($yValues, $xValues, $const)
	Execute the regression and calculate the goodness of fit for a set of X and Y data values. More...

Additional Inherited Members
Protected Member Functions inherited from PHPExcel_Best_Fit
	_calculateGoodnessOfFit ($sumX, $sumY, $sumX2, $sumY2, $sumXY, $meanX, $meanY, $const)

	_leastSquareFit ($yValues, $xValues, $const)

Detailed Description

Definition at line 39 of file exponentialBestFitClass.php.

Constructor & Destructor Documentation

◆ __construct()

PHPExcel_Exponential_Best_Fit::__construct	(	$yValues,
		$xValues = `array()`,
		$const = `True`
	)

Define the regression and calculate the goodness of fit for a set of X and Y data values.

Parameters

float[]	$yValues	The set of Y-values for this regression
float[]	$xValues	The set of X-values for this regression
boolean	$const

Reimplemented from PHPExcel_Best_Fit.

Definition at line 142 of file exponentialBestFitClass.php.

                                                                      {
                if (parent::__construct($yValues, $xValues) !== False) {
                        $this->_exponential_regression($yValues, $xValues, $const);
                }
        }       //      function __construct()

References _exponential_regression().

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Member Function Documentation

◆ _exponential_regression()

PHPExcel_Exponential_Best_Fit::_exponential_regression	(	$yValues,
		$xValues,
		$const
	)

private

Execute the regression and calculate the goodness of fit for a set of X and Y data values.

Parameters

float[]	$yValues	The set of Y-values for this regression
float[]	$xValues	The set of X-values for this regression
boolean	$const

Definition at line 121 of file exponentialBestFitClass.php.

                                                                             {
                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()

References PHPExcel_Best_Fit\_leastSquareFit().

Referenced by __construct().

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◆ getEquation()

PHPExcel_Exponential_Best_Fit::getEquation ( $dp = 0 )

Return the Equation of the best-fit line.

Parameters

int $dp Number of places of decimal precision to display

Returns: string

Reimplemented from PHPExcel_Best_Fit.

Definition at line 78 of file exponentialBestFitClass.php.

                                           {
                $slope = $this->getSlope($dp);
                $intersect = $this->getIntersect($dp);
 
                return 'Y = '.$intersect.' * '.$slope.'^X';
        }       //      function getEquation()

References getIntersect(), and getSlope().

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◆ getIntersect()

PHPExcel_Exponential_Best_Fit::getIntersect ( $dp = 0 )

Return the Value of X where it intersects Y = 0.

Parameters

int $dp Number of places of decimal precision to display

Returns: string

Reimplemented from PHPExcel_Best_Fit.

Definition at line 106 of file exponentialBestFitClass.php.

                                            {
                if ($dp != 0) {
                        return round(exp($this->_intersect),$dp);
                }
                return exp($this->_intersect);
        }       //      function getIntersect()

Referenced by getEquation(), getValueOfXForY(), and getValueOfYForX().

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◆ getSlope()

PHPExcel_Exponential_Best_Fit::getSlope ( $dp = 0 )

Return the Slope of the line.

Parameters

int $dp Number of places of decimal precision to display

Returns: string

Reimplemented from PHPExcel_Best_Fit.

Definition at line 92 of file exponentialBestFitClass.php.

                                        {
                if ($dp != 0) {
                        return round(exp($this->_slope),$dp);
                }
                return exp($this->_slope);
        }       //      function getSlope()

Referenced by getEquation(), getValueOfXForY(), and getValueOfYForX().

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◆ getValueOfXForY()

PHPExcel_Exponential_Best_Fit::getValueOfXForY ( $yValue )

Return the X-Value for a specified value of Y.

Parameters

float $yValue Y-Value

Returns: float X-Value

Reimplemented from PHPExcel_Best_Fit.

Definition at line 67 of file exponentialBestFitClass.php.

                                                 {
                return log(($yValue + $this->_Yoffset) / $this->getIntersect()) / log($this->getSlope());
        }       //      function getValueOfXForY()

References getIntersect(), and getSlope().

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◆ getValueOfYForX()

PHPExcel_Exponential_Best_Fit::getValueOfYForX ( $xValue )

Return the Y-Value for a specified value of X.

Parameters

float $xValue X-Value

Returns: float Y-Value

Reimplemented from PHPExcel_Best_Fit.

Definition at line 56 of file exponentialBestFitClass.php.

                                                 {
                return $this->getIntersect() * pow($this->getSlope(),($xValue - $this->_Xoffset));
        }       //      function getValueOfYForX()

References getIntersect(), and getSlope().

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Field Documentation

◆ $_bestFitType

PHPExcel_Exponential_Best_Fit::$_bestFitType = 'exponential'

protected

Definition at line 47 of file exponentialBestFitClass.php.

The documentation for this class was generated from the following file:

libs/composer/vendor/phpoffice/phpexcel/Classes/PHPExcel/Shared/trend/exponentialBestFitClass.php

Public Member Functions

Protected Attributes

Private Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ _exponential_regression()

◆ getEquation()

◆ getIntersect()

◆ getSlope()

◆ getValueOfXForY()

◆ getValueOfYForX()

Field Documentation

◆ $_bestFitType