src/Chippyash/Math/Matrix/MatrixFactory.php
<?php
/*
* Math-Matrix library
*
* @author Ashley Kitson <akitson@zf4.biz>
* @copyright Ashley Kitson, UK, 2014
* @licence GPL V3 or later : http://www.gnu.org/licenses/gpl.html
* @link http://en.wikipedia.org/wiki/Matrix_(mathematics)
*/
namespace Chippyash\Math\Matrix;
use Chippyash\Type\Number\Complex\ComplexType;
use Chippyash\Type\Number\Complex\ComplexTypeFactory;
use Chippyash\Type\Number\Rational\RationalType;
use Chippyash\Type\Number\Rational\RationalTypeFactory;
use Chippyash\Math\Matrix\Exceptions\MathMatrixException;
use Chippyash\Type\Number\IntType;
/**
* Static factory to create the various standard numerical matrices
*
*/
abstract class MatrixFactory
{
/**
*
* @param string $type
* @param array $data
* @return \Chippyash\Math\Matrix\NumericMatrix
*/
public static function create($type, array $data)
{
switch (strtolower($type)) {
case 'complex':
return self::createComplex($data);
case 'rational':
return self::createRational($data);
case 'numeric':
default:
return self::createNumeric($data);
}
}
/**
* Create and return a complex number matrix
* $data elements are either:
* - a ComplexType
* - string representations of complex number
* - a 2 item array representing r & i e.g. [2,-4] = '2-4i'
*
* @param array $data
*
* @return \Chippyash\Math\Matrix\ComplexMatrix
*
* @throws \Chippyash\Math\Matrix\Exceptions\MathMatrixException
*/
public static function createComplex(array $data)
{
foreach ($data as &$row) {
foreach ($row as &$item) {
if (!$item instanceof ComplexType) {
if (is_array($item) && count($item) == 2) {
$item = ComplexTypeFactory::create($item[0], $item[1]);
} elseif (is_string($item)) {
try {
$item = ComplexTypeFactory::fromString($item);
} catch (\InvalidArgumentException $e) {
throw new MathMatrixException('Invalid item type for Complex Matrix');
}
} else {
throw new MathMatrixException('Invalid item type for Complex Matrix');
}
}
}
}
return new ComplexMatrix($data);
}
/**
* Create and return a rational number matrix
* $data elements are either:
* - a RationalType
* - string representations of rational number
* - a PHP float
* - a 2 item array representing numerator & denominator e.g. [2,-4] = '-2/4'
*
* @param array $data
*
* @return \Chippyash\Math\Matrix\RationalMatrix
*
* @throws \Chippyash\Math\Matrix\Exceptions\MathMatrixException
*/
public static function createRational(array $data)
{
foreach ($data as &$row) {
foreach ($row as &$item) {
if (!$item instanceof RationalType) {
if (is_array($item) && count($item) == 2) {
$item = RationalTypeFactory::create($item[0], $item[1]);
} elseif (is_string($item)) {
try {
$item = RationalTypeFactory::fromString($item);
} catch (\InvalidArgumentException $e) {
throw new MathMatrixException('Invalid item type for Rational Matrix');
}
} elseif(is_float($item)) {
$item = RationalTypeFactory::fromFloat($item);
} else {
throw new MathMatrixException('Invalid item type for Rational Matrix');
}
}
}
}
return new RationalMatrix($data);
}
/**
* Create and return a numeric value matrix
*
* @param array $data
* @return \Chippyash\Math\Matrix\NumericMatrix
*/
public static function createNumeric(array $data)
{
return new NumericMatrix($data);
}
/**
* Construct a complete matrix whose entries are a result of a function
*
* The function must accept two parameters
* e.g. $function($row, $col) {return $row - $col;}
*
* $row and $col are 1 based
*
* @param callable $fn
* @param IntType $rows Number of required rows
* @param IntType $cols Number or required columns
* @param string $type ['numeric'|'rational'|'complex']
*
* @return \Chippyash\Math\Matrix\ComplexMatrix|\Chippyash\Math\Matrix\NumericMatrix|\Chippyash\Math\Matrix\RationalMatrix
*
* @throws \InvalidArgumentException
*/
public static function createFromFunction(callable $fn, IntType $rows, IntType $cols, $type = 'numeric')
{
if ($rows() < 1) {
throw new \InvalidArgumentException('$rows must be >= 1');
}
if ($cols() < 1) {
throw new \InvalidArgumentException('$cols must be >= 1');
}
$source = array();
$rc = $rows();
$cc = $cols();
for ($r = 0; $r < $rc; $r++) {
for ($c = 0; $c < $cc; $c++) {
$source[$r][$c] = $fn($r + 1, $c + 1);
}
}
return self::create($type, $source);
}
/**
* Create a matrix representation of a complex number
* For z = a+bi
* Returns [[a, -b]
* [b, a]]
*
* @param \Chippyash\Type\Number\Complex\ComplexType $c
* @return \Chippyash\Math\Matrix\RationalMatrix
*/
public static function createFromComplex(ComplexType $c)
{
$a = clone $c->r();
$b = clone $c->i();
$b2 = clone $c->i();
$bi = new RationalType($b2->numerator()->negate(), $b->denominator());
return self::createRational([[$a, $bi],[$b, $a]]);
}
}