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<?php /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4 foldmethod=marker: / // {{{ Header /* * File contains abstract class Math_Numerical_RootFinding_Common for all * method classes. * * PHP versions 4 and 5 * * LICENSE: * * BSD License * * Copyright (c) 2004-2006 Firman Wandayandi * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. Neither the name of Firman Wandayandi nor the names of * 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 OWNER OR 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. * * @category Math * @package Math_Numerical_RootFinding * @subpackage Methods * @author Firman Wandayandi <firman@php.net> * @copyright Copyright (c) 2004-2006 Firman Wandayandi * @license http://www.opensource.org/licenses/bsd-license.php * BSD License * @version CVS: $Id: Common.php,v 1.2 2006/01/30 18:33:13 firman Exp $ / // }}} // {{{ Dependencies /* * Load PEAR for errors handling. / require_once 'PEAR.php'; // }}} // {{{ Class: Math_Numerical_RootFinding_Common /* * Abstract class contains common properties and methods for specified * method classes. * * @category Math * @package Math_Numerical_RootFinding * @subpackage Methods * @author Firman Wandayandi <firman@php.net> * @copyright Copyright (c) 2004-2006 Firman Wandayandi * @license http://www.opensource.org/licenses/bsd-license.php * BSD License * @version Release: 1.0.0 * @abstract / class Math_Numerical_RootFinding_Common { // {{{ Properties /* * Options. * Known options: * <pre> * max_iteration int Maximum iteration count. * err_tolerance float Error tolerance. * divergent_skip bool Flag whether to skip the current iteration if * divergent rows detected or not. * </pre> * * @var array * @access protected / var $options = array( 'max_iteration' => 30, 'err_tolerance' => 1E-005, 'divergent_skip' => true ); /* * Iteration count. * * @var int * @access protected / var $iterationCount = 0; /* * Epsilon error. * * @var float * @access protected / var $epsError = 0; /* * Root value. * * @var float * @access protected / var $root = null; // }}} // {{{ Constructor /* * Constructor. * * @param array $options (optional) Options. * * @access public * @see set() / function Math_Numerical_RootFinding_Common($options = null) { if ($options !== null) { $this->set($options); } } // }}} // {{{ set() /* * Set the option(s). * * Set a single option or multiple options. * * @param mixed $option A string with option name as value for * single option or An associative array contains * options array('<option>' => <value>) for multiple * options. * @param mixed $value (optional) Option value. Require when $option is * string (single option mode). * * @return bool\|PEAR_Error TRUE on success or PEAR_Error on failure. * @access public / function set($option, $value = null) { if (!is_array($option) && !is_string($option)) { return PEAR::raiseError('Type mismatch for $option argument'); } if (is_array($option)) { foreach ($option as $key => $val) { $err = $this->set($key, $val); if (PEAR::isError($err)) { return $err; } } } elseif (is_string($option)) { if (isset($this->options[$option])) { if (!isset($value)) { return PEAR::raiseError('No value given for option ' . '\'' . $option . '\''); } // Attempt to casting variable type. settype($value, gettype($this->options[$option])); $this->options[$option] = $value; } else { return PEAR::raiseError('Unknown option \'' . $option . '\''); } } } // }}} // {{{ compute() /* * Compute the root. * * This method implemented in the extend class of this class. * Please Note: DIFFERENT METHOD, DIFFERENT PARAMETERS. * See the function parameter carefully or error will be * throwed. For information about parameter just call * infoCompute(). * * @abstract() / function compute() { return PEAR::raiseError('This function not implemented'); } // }}} // {{{ getRoot() /* * Get root value. * * @return float Root value. * @access public / function getRoot() { return $this->root; } // }}} // {{{ getIterationCount() /* * Get iteration count. * * @return int Iteration count. * @access public / function getIterationCount() { return $this->iterationCount; } // }}} // {{{ getEpsError() /* * Get epsilon error. * * @return float Epsilon error. * @access public / function getEpsError() { return $this->epsError; } // }}} // {{{ isDivergentRows() /* * Detect for divergent rows. * * Compare 3 rows of last epsilon errors, if no.3 bigger than no.2 and * no.2 bigger than no.1, rows are divergent. * * @param array $epsilonErrors Epsilon errors collection * * @return bool TRUE if divergent, otherwise FALSE * @access public / function isDivergentRows($epsErrors) { $n = count($epsErrors); if ($n >= 3) { if ($epsErrors[$n - 1] > $epsErrors[$n - 2] && $epsErrors[$n - 2] > $epsErrors[$n - 3]) { return true; } } return false; } // }}} // {{{ reset() /* * Reset all values. * * This method allow you to use same object with different parameter. * * @access public / function reset() { $this->iterationCount = 0; $this->epsError = 0; $this->root = null; } // }}} // {{{ validateEqFunction() /* * Validate equation function or object/method. * * Simple function to know the whether equation function or object/method * callback is working. * * @param string $eqFunction Equation function name or object method tuple. * * @return bool\|PEAR_Error TRUE on success or PEAR_Error on failure. * @access public * @see getEqResult() * @static / function validateEqFunction($eqFunction) { $err = Math_Numerical_RootFinding_Common::getEqResult($eqFunction, 1); if(PEAR::isError($err)) { return $err; } return true; } // }}} // {{{ getEqResult() /* * Compute a value using given equation function or object/method. * * @param callback $eqFunction Equation function name or object method tuple. * @param float $varValue Variable value. * * @return float\|PEAR_Error result value on success, PEAR_Error on failure. * @access public * @static / function getEqResult($eqFunction, $varValue) { if (is_callable($eqFunction, false, $callable_name)) { return call_user_func($eqFunction, $varValue); } return PEAR::raiseError('Unable call equation function or method ' . '\'' . $callable_name . '()\''); } // }}} } // }}} / * Local variables: * mode: php * tab-width: 4 * c-basic-offset: 4 * c-hanging-comment-ender-p: nil * End: */ ?>

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