ccbb28167b
git-svn-id: https://phpexcel.svn.codeplex.com/svn/trunk@66338 2327b42d-5241-43d6-9e2a-de5ac946f064
73 lines
2.3 KiB
PHP
73 lines
2.3 KiB
PHP
<?php
|
|
/**
|
|
* PHPExcel
|
|
*
|
|
* Copyright (c) 2006 - 2011 PHPExcel
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* @category PHPExcel
|
|
* @package PHPExcel_Shared_Best_Fit
|
|
* @copyright Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
|
|
* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
|
|
* @version ##VERSION##, ##DATE##
|
|
*/
|
|
|
|
|
|
require_once(PHPEXCEL_ROOT . 'PHPExcel/Shared/trend/bestFitClass.php');
|
|
|
|
|
|
/**
|
|
* PHPExcel_Linear_Best_Fit
|
|
*
|
|
* @category PHPExcel
|
|
* @package PHPExcel_Shared_Best_Fit
|
|
* @copyright Copyright (c) 2006 - 2011 PHPExcel (http://www.codeplex.com/PHPExcel)
|
|
*/
|
|
class PHPExcel_Linear_Best_Fit extends PHPExcel_Best_Fit
|
|
{
|
|
protected $_bestFitType = 'linear';
|
|
|
|
|
|
public function getValueOfYForX($xValue) {
|
|
return $this->getIntersect() + $this->getSlope() * $xValue;
|
|
} // function getValueOfYForX()
|
|
|
|
|
|
public function getValueOfXForY($yValue) {
|
|
return ($yValue - $this->getIntersect()) / $this->getSlope();
|
|
} // function getValueOfXForY()
|
|
|
|
|
|
public function getEquation($dp=0) {
|
|
$slope = $this->getSlope($dp);
|
|
$intersect = $this->getIntersect($dp);
|
|
|
|
return 'Y = '.$intersect.' + '.$slope.' * X';
|
|
} // function getEquation()
|
|
|
|
|
|
private function _linear_regression($yValues, $xValues, $const) {
|
|
$this->_leastSquareFit($yValues, $xValues,$const);
|
|
} // function _linear_regression()
|
|
|
|
|
|
function __construct($yValues, $xValues=array(), $const=True) {
|
|
if (parent::__construct($yValues, $xValues) !== False) {
|
|
$this->_linear_regression($yValues, $xValues, $const);
|
|
}
|
|
} // function __construct()
|
|
|
|
} // class linearBestFit
|