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<?php require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/trend/linearBestFitClass.php'; require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/trend/logarithmicBestFitClass.php'; require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/trend/exponentialBestFitClass.php'; require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/trend/powerBestFitClass.php'; require_once PHPEXCEL_ROOT . 'PHPExcel/Shared/trend/polynomialBestFitClass.php'; /** * PHPExcel_trendClass * * Copyright (c) 2006 - 2015 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_Trend * @copyright Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel) * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL * @version ##VERSION##, ##DATE## */ class trendClass { const TREND_LINEAR = 'Linear'; const TREND_LOGARITHMIC = 'Logarithmic'; const TREND_EXPONENTIAL = 'Exponential'; const TREND_POWER = 'Power'; const TREND_POLYNOMIAL_2 = 'Polynomial_2'; const TREND_POLYNOMIAL_3 = 'Polynomial_3'; const TREND_POLYNOMIAL_4 = 'Polynomial_4'; const TREND_POLYNOMIAL_5 = 'Polynomial_5'; const TREND_POLYNOMIAL_6 = 'Polynomial_6'; const TREND_BEST_FIT = 'Bestfit'; const TREND_BEST_FIT_NO_POLY = 'Bestfit_no_Polynomials'; /** * Names of the best-fit trend analysis methods * * @var string[] **/ private static $trendTypes = array( self::TREND_LINEAR, self::TREND_LOGARITHMIC, self::TREND_EXPONENTIAL, self::TREND_POWER ); /** * Names of the best-fit trend polynomial orders * * @var string[] **/ private static $trendTypePolynomialOrders = array( self::TREND_POLYNOMIAL_2, self::TREND_POLYNOMIAL_3, self::TREND_POLYNOMIAL_4, self::TREND_POLYNOMIAL_5, self::TREND_POLYNOMIAL_6 ); /** * Cached results for each method when trying to identify which provides the best fit * * @var PHPExcel_Best_Fit[] **/ private static $trendCache = array(); public static function calculate($trendType = self::TREND_BEST_FIT, $yValues, $xValues = array(), $const = true) { // Calculate number of points in each dataset $nY = count($yValues); $nX = count($xValues); // Define X Values if necessary if ($nX == 0) { $xValues = range(1, $nY); $nX = $nY; } elseif ($nY != $nX) { // Ensure both arrays of points are the same size trigger_error("trend(): Number of elements in coordinate arrays do not match.", E_USER_ERROR); } $key = md5($trendType.$const.serialize($yValues).serialize($xValues)); // Determine which trend method has been requested switch ($trendType) { // Instantiate and return the class for the requested trend method case self::TREND_LINEAR: case self::TREND_LOGARITHMIC: case self::TREND_EXPONENTIAL: case self::TREND_POWER: if (!isset(self::$trendCache[$key])) { $className = 'PHPExcel_'.$trendType.'_Best_Fit'; self::$trendCache[$key] = new $className($yValues, $xValues, $const); } return self::$trendCache[$key]; case self::TREND_POLYNOMIAL_2: case self::TREND_POLYNOMIAL_3: case self::TREND_POLYNOMIAL_4: case self::TREND_POLYNOMIAL_5: case self::TREND_POLYNOMIAL_6: if (!isset(self::$trendCache[$key])) { $order = substr($trendType, -1); self::$trendCache[$key] = new PHPExcel_Polynomial_Best_Fit($order, $yValues, $xValues, $const); } return self::$trendCache[$key]; case self::TREND_BEST_FIT: case self::TREND_BEST_FIT_NO_POLY: // If the request is to determine the best fit regression, then we test each trend line in turn // Start by generating an instance of each available trend method foreach (self::$trendTypes as $trendMethod) { $className = 'PHPExcel_'.$trendMethod.'BestFit'; $bestFit[$trendMethod] = new $className($yValues, $xValues, $const); $bestFitValue[$trendMethod] = $bestFit[$trendMethod]->getGoodnessOfFit(); } if ($trendType != self::TREND_BEST_FIT_NO_POLY) { foreach (self::$trendTypePolynomialOrders as $trendMethod) { $order = substr($trendMethod, -1); $bestFit[$trendMethod] = new PHPExcel_Polynomial_Best_Fit($order, $yValues, $xValues, $const); if ($bestFit[$trendMethod]->getError()) { unset($bestFit[$trendMethod]); } else { $bestFitValue[$trendMethod] = $bestFit[$trendMethod]->getGoodnessOfFit(); } } } // Determine which of our trend lines is the best fit, and then we return the instance of that trend class arsort($bestFitValue); $bestFitType = key($bestFitValue); return $bestFit[$bestFitType]; default: return false; } } }
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