mirror of
https://github.com/Karaka-Management/phpOMS.git
synced 2026-01-16 03:58:39 +00:00
471 lines
12 KiB
PHP
471 lines
12 KiB
PHP
<?php
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namespace phpOMS\Math\Matrix;
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class Matrix implements \ArrayAccess, \Iterator
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{
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protected $matrix = [];
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protected $n = 0;
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protected $m = 0;
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public function __construct(int $m, int $n = 1)
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{
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$this->n = $n;
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$this->m = $m;
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for ($i = 0; $i < $m; $i++) {
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$this->matrix[$i] = array_fill(0, $n, 0);
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}
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}
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public function setMatrix(array $matrix)
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{
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if ($this->m !== count($matrix) || $this->n !== count($matrix[0])) {
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throw new \Exception('Dimension');
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}
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$this->matrix = $matrix;
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}
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public function getMatrix() : array
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{
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return $this->matrix;
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}
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public function set(int $m, int $n, $value)
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{
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$this->matrix[$m][$n] = $value;
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}
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public function get(int $m, int $n)
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{
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return $this->matrix[$m][$n];
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}
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public function transpose() : Matrix
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{
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$matrix = new Matrix($this->n, $this->m);
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$matrix->setMatrix(array_map(null, $matrix->getMatrix()));
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return $matrix;
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}
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public function mult($value) : Matrix
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{
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if ($value instanceOf Matrix) {
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return $this->multMatrix($value);
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} elseif (is_scalar($value)) {
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return $this->multScalar($value);
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}
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throw new \Exception();
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}
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private function multMatrix(Matrix $matrix) : Matrix
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{
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$nDim = $matrix->getN();
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$mDim = $matrix->getM();
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if ($this->n !== $mDim) {
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throw new \Exception('Dimension');
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}
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$matrixArr = $matrix->getMatrix();
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$newMatrix = new Matrix($this->m, $nDim);
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$newMatrixArr = $newMatrix->getMatrix();
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for ($i = 0; $i < $this->m; $i++) { // Row of $this
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for ($c = 0; $c < $nDim; $c++) { // Column of $matrix
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$temp = 0;
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for ($j = 0; $j < $mDim; $i++) { // Row of $matrix
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$temp += $this->matrix[$i][$j] * $matrixArr[$j][$c];
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}
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$newMatrixArr[$i][$c] = $temp;
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}
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}
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$newMatrix->setMatrix($newMatrixArr);
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return $newMatrix;
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}
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private function multScalar($value) : Matrix
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{
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$newMatrixArr = $this->matrix;
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foreach ($newMatrixArr as $i => $vector) {
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foreach ($vector as $j => $value) {
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$newMatrixArr[$i][$j] *= $value;
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}
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}
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$newMatrix = new Matrix($this->m, $this->n);
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$newMatrix->setMatrix($newMatrixArr);
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return $newMatrix;
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}
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public function add($value) : Matrix
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{
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if ($value instanceOf Matrix) {
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return $this->addMatrix($value);
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} elseif (is_scalar($value)) {
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return $this->addScalar($value);
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}
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throw new \Exception();
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}
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public function sub($value) : Matrix
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{
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if ($value instanceOf Matrix) {
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return $this->add($this->mult(-1));
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} elseif (is_scalar($value)) {
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return $this->add(-$value);
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}
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throw new \Exception();
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}
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private function addMatrix(Matrix $value) : Matrix
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{
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if ($this->m !== $value->getM() || $this->n !== $value->getN()) {
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throw new \Exception('Dimension');
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}
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$matrixArr = $value->getMatrix();
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$newMatrixArr = $this->matrix;
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foreach ($newMatrixArr as $i => $vector) {
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foreach ($vector as $j => $value) {
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$newMatrixArr[$i][$j] += $matrixArr[$i][$j];
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}
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}
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$newMatrix = new Matrix($this->m, $this->n);
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$newMatrix->setMatrix($newMatrixArr);
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return $newMatrix;
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}
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private function addScalar($value) : Matrix
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{
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$newMatrixArr = $this->matrix;
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foreach ($newMatrixArr as $i => $vector) {
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foreach ($vector as $j => $value) {
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$newMatrixArr[$i][$j] += $value;
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}
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}
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$newMatrix = new Matrix($this->m, $this->n);
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$newMatrix->setMatrix($newMatrixArr);
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return $newMatrix;
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}
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public function upperTriangular() : Matrix
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{
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$matrix = new Matrix($this->n, $this->n);
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$matrixArr = $this->matrix;
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$this->upperTrianglize($matrixArr);
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$matrix->setMatrix($matrixArr);
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return $matrix;
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}
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public function lowerTriangular() : Matrix
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{
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// todo: implement
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return new Matrix($this->m, $this->n);
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}
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public function inverse(int $algorithm = InversionType::GAUSS_JORDAN) : Matrix
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{
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if ($this->n !== $this->m) {
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throw new \Exception('Dimension');
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}
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switch ($algorithm) {
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case InversionType::GAUSS_JORDAN:
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return $this->inverseGaussJordan();
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default:
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throw new \Exception('');
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}
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}
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private function inverseGaussJordan() : Matrix
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{
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$newMatrixArr = $this->matrix;
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// extending matrix by identity matrix
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for ($i = 0; $i < $this->n; $i++) {
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for ($j = $this->n; $j < $this->n * 2; $j++) {
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if ($j === ($i + $this->n)) {
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$newMatrixArr[$i][$j] = 1;
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} else {
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$newMatrixArr[$i][$j] = 0;
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}
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}
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}
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$mDim = count($newMatrixArr);
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$nDim = count($newMatrixArr[0]);
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// pivoting
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$newMatrixArr = $this->diag($newMatrixArr);
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/* create unit matrix */
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for ($i = 0; $i < $mDim; $i++) {
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$temp = $newMatrixArr[$i][$i];
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for ($j = 0; $j < $nDim; $j++) {
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$newMatrixArr[$i][$j] = $newMatrixArr[$i][$j] / $temp;
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}
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}
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/* removing identity matrix */
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for ($i = 0; $i < $mDim; $i++) {
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$newMatrixArr[$i] = array_slice($newMatrixArr[$i], $mDim);
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}
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$newMatrix = new Matrix($this->n, $this->n);
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$newMatrix->setMatrix($newMatrixArr);
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return $newMatrix;
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}
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private function decompositionCholesky() : Matrix
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{
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$newMatrix = new Matrix($this->n, $this->n);
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$newMatrixArr = $newMatrix->getMatrix();
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for ($i = 0; $i < $this->n; $i++) {
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for ($j = 0; $j < $i + 1; $j++) {
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$temp = 0;
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for ($c = 0; $c < $j; $c++) {
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$temp += $newMatrixArr[$i][$c] * $newMatrixArr[$j][$c];
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}
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$newMatrixArr[$i][$j] = ($i == $j) ? sqrt($this->matrix[$i][$i] - $temp) : (1 / $newMatrixArr[$j][$j] * ($this->matrix[$i][$j] - $temp));
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}
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}
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$newMatrix->setMatrix($newMatrixArr);
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return $newMatrix;
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}
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private function diag(array $arr) : array
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{
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$mDim = count($arr);
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$nDim = count($arr[0]);
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for ($i = $mDim - 1; $i > 0; $i--) {
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if ($arr[$i - 1][0] < $arr[$i][0]) {
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for ($j = 0; $j < $nDim; $j++) {
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$temp = $arr[$i][$j];
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$arr[$i][$j] = $arr[$i - 1][$j];
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$arr[$i - 1][$j] = $temp;
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}
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}
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}
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/* create diagonal matrix */
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for ($i = 0; $i < $mDim; $i++) {
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for ($j = 0; $j < $mDim; $j++) {
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if ($j !== $i) {
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$temp = $arr[$j][$i] / $arr[$i][$i];
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for ($c = 0; $c < $nDim; $c++) {
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$arr[$j][$c] -= $arr[$i][$c] * $temp;
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}
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}
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}
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}
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return $arr;
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}
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private function upperTrianglize(array &$arr) : int
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{
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$n = count($arr);
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$sign = 1;
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for ($i = 0; $i < $n; $i++) {
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$max = 0;
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for ($j = $i; $j < $n; $j++) {
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if (abs($arr[$j][$i]) > abs($arr[$max][$i])) {
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$max = $j;
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}
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}
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if ($max) {
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$sign = -$sign;
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$temp = $arr[$i];
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$arr[$i] = $arr[$max];
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$arr[$max] = $temp;
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}
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if (!$arr[$i][$i]) {
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return 0;
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}
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for ($j = $i + 1; $j < $n; $j++) {
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$r = $arr[$j][$i] / $arr[$i][$i];
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if (!$r) {
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continue;
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}
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for ($c = $i; $c < $n; $c++) {
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$arr[$j][$c] -= $arr[$i][$c] * $r;
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}
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}
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}
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return $sign;
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}
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public function det()
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{
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if ($this->n === 1) {
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return $this->matrix[0][0];
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}
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$trianglize = $this->matrix;
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$prod = $this->upperTrianglize($trianglize);
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for ($i = 0; $i < $this->n; $i++) {
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$prod *= $trianglize[$i][$i];
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}
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return $prod;
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}
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/**
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* Return the current element
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* @link http://php.net/manual/en/iterator.current.php
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* @return mixed Can return any type.
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* @since 5.0.0
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*/
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public function current()
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{
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// TODO: Implement current() method.
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}
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/**
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* Move forward to next element
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* @link http://php.net/manual/en/iterator.next.php
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* @return void Any returned value is ignored.
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* @since 5.0.0
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*/
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public function next()
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{
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// TODO: Implement next() method.
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}
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/**
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* Return the key of the current element
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* @link http://php.net/manual/en/iterator.key.php
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* @return mixed scalar on success, or null on failure.
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* @since 5.0.0
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*/
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public function key()
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{
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// TODO: Implement key() method.
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}
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/**
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* Checks if current position is valid
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* @link http://php.net/manual/en/iterator.valid.php
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* @return boolean The return value will be casted to boolean and then evaluated.
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* Returns true on success or false on failure.
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* @since 5.0.0
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*/
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public function valid()
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{
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// TODO: Implement valid() method.
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}
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/**
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* Rewind the Iterator to the first element
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* @link http://php.net/manual/en/iterator.rewind.php
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* @return void Any returned value is ignored.
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* @since 5.0.0
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*/
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public function rewind()
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{
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// TODO: Implement rewind() method.
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}
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/**
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* Whether a offset exists
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* @link http://php.net/manual/en/arrayaccess.offsetexists.php
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* @param mixed $offset <p>
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* An offset to check for.
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* </p>
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* @return boolean true on success or false on failure.
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* </p>
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* <p>
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* The return value will be casted to boolean if non-boolean was returned.
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* @since 5.0.0
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*/
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public function offsetExists($offset)
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{
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// TODO: Implement offsetExists() method.
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}
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/**
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* Offset to retrieve
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* @link http://php.net/manual/en/arrayaccess.offsetget.php
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* @param mixed $offset <p>
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* The offset to retrieve.
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* </p>
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* @return mixed Can return all value types.
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* @since 5.0.0
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*/
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public function offsetGet($offset)
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{
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// TODO: Implement offsetGet() method.
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}
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/**
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* Offset to set
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* @link http://php.net/manual/en/arrayaccess.offsetset.php
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* @param mixed $offset <p>
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* The offset to assign the value to.
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* </p>
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* @param mixed $value <p>
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* The value to set.
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* </p>
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* @return void
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* @since 5.0.0
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*/
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public function offsetSet($offset, $value)
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{
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// TODO: Implement offsetSet() method.
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}
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/**
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* Offset to unset
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* @link http://php.net/manual/en/arrayaccess.offsetunset.php
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* @param mixed $offset <p>
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* The offset to unset.
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* </p>
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* @return void
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* @since 5.0.0
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*/
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public function offsetUnset($offset)
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{
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// TODO: Implement offsetUnset() method.
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}
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} |