Refactoring Matrix class

Author: apphp

classes/mathematics/Matrix.php

@@ -1,6 +1,6 @@
 <?php
 
-use app\classes\mathematics\Matrix;
+use Apphp\MLKit\Math\Linear\Matrix;
 
 $matrix1 = new Matrix([[1, 2], [3, 4]]);
 $matrix2 = new Matrix([[5, 6], [7, 8]]);
@@ -19,3 +19,53 @@
 echo "Cofactor Matrix of Matrix 1:\n" . $matrix1->cofactorMatrix()->toString() . "\n";
 echo "Adjugate Matrix of Matrix 1:\n" . $matrix1->adjugateMatrix()->toString() . "\n";
 echo "Inverse of Matrix 1:\n" . $matrix1->inverse()->toString() . "\n";
+
+echo "\nIdentity Matrix (3x3):\n" . Matrix::identity(3)->toString() . "\n";
+echo "Zero Matrix (2x3):\n" . Matrix::zero(2, 3)->toString() . "\n";
+echo "Is Matrix 1 square? " . ($matrix1->isSquare() ? 'Yes' : 'No') . "\n";
+echo "Is Matrix 1 symmetric? " . ($matrix1->isSymmetric() ? 'Yes' : 'No') . "\n";
+echo "Trace of Matrix 1: " . $matrix1->trace() . "\n";
+echo "First row of Matrix 1: [" . implode(', ', $matrix1->getRow(0)) . "]\n";
+echo "Second column of Matrix 2: [" . implode(', ', $matrix2->getColumn(1)) . "]\n";
+echo "Are Matrix 1 and Matrix 2 equal? " . ($matrix1->equals($matrix2) ? 'Yes' : 'No') . "\n";
+
+// Example of fill and map
+$filled = new Matrix([[0, 0], [0, 0]]);
+$filled->fill(9);
+echo "Filled Matrix (all 9s):\n" . $filled->toString() . "\n";
+
+$mapped = $matrix1->map(fn($v) => $v * 10);
+echo "Matrix 1 with each element multiplied by 10 (map):\n" . $mapped->toString() . "\n";
+
+// --- Additional Examples ---
+
+// Matrix shape, size, and dimensions
+$matrix3 = new Matrix([[1,2,3],[4,5,6],[7,8,9]]);
+echo "Matrix 3:\n" . $matrix3->toString() . "\n";
+echo 'Matrix 3: ' . $matrix3->getRows() . ' rows x ' . $matrix3->getCols() . " columns\n";
+echo 'Matrix 3 is square? ' . ($matrix3->isSquare() ? 'Yes' : 'No') . "\n";
+echo 'Matrix 3 size (total elements): ' . ($matrix3->getRows() * $matrix3->getCols()) . "\n";
+
+// Accessing a single element (row 2, col 3)
+echo 'Element at row 2, column 3 of Matrix 3: ' . $matrix3->getRow(1)[2] . "\n";
+
+// Absolute value (element-wise)
+$negMatrix = new Matrix([[-1, -2], [3, -4]]);
+$absMatrix = $negMatrix->map(fn($v) => abs($v));
+echo "Absolute value of negMatrix:\n" . $absMatrix->toString() . "\n";
+
+// Row and column sums
+$rowSums = array_map(fn($row) => array_sum($row), $matrix3->toArray());
+echo 'Row sums of Matrix 3: [' . implode(', ', $rowSums) . "]\n";
+$colSums = [];
+for ($j = 0; $j < $matrix3->getCols(); $j++) {
+    $col = $matrix3->getColumn($j);
+    $colSums[] = array_sum($col);
+}
+echo 'Column sums of Matrix 3: [' . implode(', ', $colSums) . "]\n";
+
+// Minimum, maximum, mean
+$all = array_merge(...$matrix3->toArray());
+echo 'Minimum value in Matrix 3: ' . min($all) . "\n";
+echo 'Maximum value in Matrix 3: ' . max($all) . "\n";
+echo 'Mean value in Matrix 3: ' . (array_sum($all)/count($all)) . "\n";

public/pages/mathematics-for-ml/matrices/php-matrix-operations-usage.php

@@ -14,5 +14,5 @@
 </div>
 
 <div>
-    <?= create_example_of_use_links(APP_PATH . 'classes/mathematics/Matrix.php', title: 'Example of class <code>Matrix</code>', opened: true); ?>
+    <?= create_example_of_use_links(APP_PATH . 'src/Math/Linear/Matrix.php', title: 'Example of class <code>Matrix</code>', opened: true); ?>
 </div>