[PHP] Fungsi Perkalian Matriks

perkalian_matriks.php

<?php
/* Fungsi perkalian matriks
* @f2face - 2013
*/
function perkalian_matriks($matriks_a, $matriks_b) {
	$hasil = array();
	for ($i=0; $i<sizeof($matriks_a); $i++) {
		for ($j=0; $j<sizeof($matriks_b[0]); $j++) {
			$temp = 0;
			for ($k=0; $k<sizeof($matriks_b); $k++) {
				$temp += $matriks_a[$i][$k] * $matriks_b[$k][$j];
			}
			$hasil[$i][$j] = $temp;
		}
	}
	return $hasil;
}

//---------------------------------------------------------------------------
// Contoh penggunaan :
// Matriks A
$a = array();
$a[] = array(1, 2, 3);
$a[] = array(4, 5, 6);
$a[] = array(7, 8, 9);
$a[] = array(10, 11, 12);

// Matriks B
$b = array();
$b[] = array(1, 2, 3, 4);
$b[] = array(5, 6, 7, 8);
$b[] = array(9, 10, 11, 12);

// Kalikan
$hasil = perkalian_matriks($a, $b);
echo "<table border='1' cellspacing='0' cellpadding='5'>";
for ($i=0; $i<sizeof($hasil); $i++) {
	echo "<tr>";
	for ($j=0; $j<sizeof($hasil[$i]); $j++) {
		echo "<td>". round($hasil[$i][$j], 4) ."</td>";
	}
	echo "</tr>";
}
echo "</table>";
?>