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<?php /** * Hoa * * * @license * * New BSD License * * Copyright © 2007-2017, Hoa community. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * Neither the name of the Hoa nor the names of its contributors may be * used to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ namespace Hoa\Math\Sampler; /** * Class \Hoa\Math\Sampler\Random. * * Random sampler. * * @copyright Copyright © 2007-2017 Hoa community * @license New BSD License */ class Random extends Sampler { /** * Construct. * * @return void */ public function construct() { if (null === $this->_parameters->getParameter('integer.min')) { $this->_parameters->setParameter( 'integer.min', max( -mt_getrandmax(), $this->_parameters->getParameter('integer.min') ) ); } if (null === $this->_parameters->getParameter('integer.max')) { $this->_parameters->setParameter( 'integer.max', min( mt_getrandmax(), $this->_parameters->getParameter('integer.max') ) ); } return; } /** * Generate a discrete uniform distribution. * * @param int $lower Lower bound value. * @param int $upper Upper bound value. * @return int */ protected function _getInteger($lower, $upper) { return mt_rand($lower, $upper); } /** * Generate a continuous uniform distribution. * * @param float $lower Lower bound value. * @param float $upper Upper bound value. * @return float */ protected function _getFloat($lower, $upper) { return $lower + lcg_value() * abs($upper - $lower); } }
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