ThinkPHP/Library/Org/Util/PHPExcel/Calculation/Engineering.php

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<?php

/** PHPExcel root directory */
if (!defined('PHPEXCEL_ROOT')) {
    /**
     * @ignore
     */
    define('PHPEXCEL_ROOT', dirname(__FILE__) . '/../../');
    require(PHPEXCEL_ROOT . 'PHPExcel/Autoloader.php');
}

/** EULER */
define('EULER', 2.71828182845904523536);

/**
 * PHPExcel_Calculation_Engineering
 *
 * 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_Calculation
 * @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 PHPExcel_Calculation_Engineering
{
    /**
     * Details of the Units of measure that can be used in CONVERTUOM()
     *
     * @var mixed[]
     */
    private static $conversionUnits = array(
        'g'     => array('Group' => 'Mass',        'Unit Name' => 'Gram',                     'AllowPrefix' => true),
        'sg'    => array('Group' => 'Mass',        'Unit Name' => 'Slug',                     'AllowPrefix' => false),
        'lbm'   => array('Group' => 'Mass',        'Unit Name' => 'Pound mass (avoirdupois)', 'AllowPrefix' => false),
        'u'     => array('Group' => 'Mass',        'Unit Name' => 'U (atomic mass unit)',     'AllowPrefix' => true),
        'ozm'   => array('Group' => 'Mass',        'Unit Name' => 'Ounce mass (avoirdupois)', 'AllowPrefix' => false),
        'm'     => array('Group' => 'Distance',    'Unit Name' => 'Meter',                    'AllowPrefix' => true),
        'mi'    => array('Group' => 'Distance',    'Unit Name' => 'Statute mile',             'AllowPrefix' => false),
        'Nmi'   => array('Group' => 'Distance',    'Unit Name' => 'Nautical mile',            'AllowPrefix' => false),
        'in'    => array('Group' => 'Distance',    'Unit Name' => 'Inch',                     'AllowPrefix' => false),
        'ft'    => array('Group' => 'Distance',    'Unit Name' => 'Foot',                     'AllowPrefix' => false),
        'yd'    => array('Group' => 'Distance',    'Unit Name' => 'Yard',                     'AllowPrefix' => false),
        'ang'   => array('Group' => 'Distance',    'Unit Name' => 'Angstrom',                 'AllowPrefix' => true),
        'Pica'  => array('Group' => 'Distance',    'Unit Name' => 'Pica (1/72 in)',           'AllowPrefix' => false),
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