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<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 4 |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the PHP license, |
// | that is bundled with this package in the file LICENSE, and is |
// | available at through the world-wide-web at |
// | http://www.php.net/license/2_02.txt. |
// | If you did not receive a copy of the PHP license and are unable to |
// | obtain it through the world-wide-web, please send a note to |
// | license@php.net so we can mail you a copy immediately. |
// +----------------------------------------------------------------------+
// | Authors: Jesus M. Castagnetto <jmcastagnetto@php.net> |
// +----------------------------------------------------------------------+
//
// $Id: Tuple.php 304045 2010-10-05 00:16:53Z clockwerx $
//
require_once "PEAR.php";
/**
* General Tuple class
* A Tuple represents a general unidimensional list of n numeric elements
* Originally this class was part of NumPHP (Numeric PHP package)
*
* @author Jesus M. Castagnetto <jmcastagnetto@php.net>
* @version 1.0
* @access public
* @package Math_Vector
*/
class Math_Tuple {
/**
* array of numeric elements
*
* @var array
* @access private
*/
var $data = null;
/**
* Constructor of Math_Tuple
*
* @param array $data array of numbers
* @access public
* @return object Math_Tuple (or PEAR_Error on error)
*/
function Math_Tuple ($data) /*{{{*/
{
if (is_array($data) || !is_array($data[0])) {
$this->data = $data;
} else {
new PEAR_Error("An unidimensional array is needed to initialize a Tuple",
null, PEAR_ERROR_DIE);
}
}/*}}}*/
/**
* Squeezes out holes in the tuple sequence
*
* @access public
* @return void
*/
function squeezeHoles ()/*{{{*/
{
$this->data = explode(":", implode(":",$this->data));
}/*}}}*/
/**
* Returns the size (number of elements) in the tuple
*
* @access public
* @return integer
*/
function getSize () /*{{{*/
{
return count($this->data);
}/*}}}*/
/**
* Sets the value of an element
*
* @access public
* @param integer $elindex element index
* @param numeric $elvalue element value
* @return mixed true if successful, PEAR_Error object otherwise
*/
function setElement ($elindex, $elvalue) /*{{{*/
{
if ($elindex >= $this->getSize()) {
return PEAR::raiseError("Wrong index: $elindex for element: $elvalue");
}
$this->data[$elindex] = $elvalue;
return true;
}/*}}}*/
/**
* Appends an element to the tuple
*
* @access public
* @param numeric $elvalue element value
* @return mixed index of appended element on success, PEAR_Error object otherwise
*/
function addElement ($elvalue) /*{{{*/
{
if (!is_numeric($elvalue)) {
return PEAR::raiseError("Error, a numeric value is needed. You used: $elvalue");
}
$this->data[$this->getSize()] = $elvalue;
return ($this->getSize() - 1);
}/*}}}*/
/**
* Remove an element from the tuple
*
* @access public
* @param integer $elindex element index
* @return mixed true on success, PEAR_Error object otherwise
*/
function delElement ($elindex) /*{{{*/
{
if ($elindex >= $this->getSize()) {
return PEAR::raiseError("Wrong index: $elindex, element not deleted");
}
unset($this->data[$elindex]);
$this->squeezeHoles();
return true;
}/*}}}*/
/**
* Returns the value of an element in the tuple
*
* @access public
* @param integer $elindex element index
* @return mixed numeric on success, PEAR_Error otherwise
*/
function getElement($elindex) /*{{{*/
{
if ($elindex >= $this->getSize()) {
return PEAR::raiseError("Wrong index: $elindex, Tuple size is: ".$this->getSize());
}
return $this->data[$elindex];
}/*}}}*/
/**
* Returns an array with all the elements of the tuple
*
* @access public
* @return $array
*/
function getData () /*{{{*/
{
$this->squeezeHoles();
return $this->data;
}/*}}}*/
/**
* Returns the minimum value of the tuple
*
* @access public
* @return numeric
*/
function getMin () /*{{{*/
{
return min($this->getData());
}/*}}}*/
/**
* Returns the maximum value of the tuple
*
* @access public
* @return numeric
*/
function getMax () /*{{{*/
{
return max($this->getData());
}/*}}}*/
/**
* Returns an array of the minimum and maximum values of the tuple
*
* @access public
* @return array of the minimum and maximum values
*/
function getMinMax () /*{{{*/
{
return array ($this->getMin(), $this->getMax());
}/*}}}*/
/**
* Gets the position of the given value in the tuple
*
* @access public
* @param numeric $val value for which the index is requested
* @return integer
*/
function getValueIndex ($val) /*{{{*/
{
for ($i=0; $i < $this->getSize(); $i++)
if ($this->data[$i] == $val)
return $i;
return false;
}/*}}}*/
/**
* Gets the position of the minimum value in the tuple
*
* @access public
* @return integer
*/
function getMinIndex () /*{{{*/
{
return $this->getValueIndex($this->getMin());
}/*}}}*/
/**
* Gets the position of the maximum value in the tuple
*
* @access public
* @return integer
*/
function getMaxIndex () /*{{{*/
{
return $this->getValueIndex($this->getMax());
}/*}}}*/
/**
* Gets an array of the positions of the minimum and maximum values in the tuple
*
* @access public
* @return array of integers indexes
*/
function getMinMaxIndex () /*{{{*/
{
return array($this->getMinIndex(), $this->getMaxIndex());
}/*}}}*/
/**
* Checks if the tuple is a a Zero tuple
*
* @access public
* @return boolean
*/
function isZero () /*{{{*/
{
for ($i=0; $i < $this->getSize(); $i++)
if ($this->data[$i] != 0)
return false;
return true;
}/*}}}*/
/**
* Returns an string representation of the tuple
*
* @access public
* @return string
*/
function toString () /*{{{*/
{
return "{ ".implode(", ",$this->data)." }";
}/*}}}*/
/**
* Returns an HTML representation of the tuple
*
* @access public
* @return string
*/
function toHTML() /*{{{*/
{
$out = "<table border>\n\t<caption align=\"top\"><b>Vector</b></caption>\n";
$out .= "\t<tr align=\"center\">\n\t\t<th>i</th><th>value</th>\n\t</tr>\n";
for ($i=0; $i < $this->getSize(); $i++) {
$out .= "\t<tr align=\"center\">\n\t\t<th>".$i."</th>";
$out .= "<td bgcolor=\"#dddddd\">".$this->data[$i]."</td>\n\t</tr>\n";
}
return $out."\n</table>\n";
}/*}}}*/
} /* end of Tuple class */
?>
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