Question

How to subtract two matrices (matrix) in PHP

Answer 1

$matrix1 = array(
            array(1, 2, 3, 4), 
            array(5, 6, 7, 8), 
            array(9, 7, 6, 3));
$matrix2 = array(
            array(1, 1, 1, 1), 
            array(2, 2, 2, 2), 
            array(3, 3, 3, 3));
$sub = array(
            array(0, 0, 0, 0), 
            array(0, 0, 0, 0), 
            array(0, 0, 0, 0));
        
$rows = count($matrix1);
$cols = count($matrix1[0]);

for ($i = 0; $i < $rows; $i++) {
    for ($j = 0; $j < $cols; $j++) {
        $sub[$i][$j] = $matrix1[$i][$j] - $matrix2[$i][$j];
    }
}

for ($i = 0; $i < $rows; $i++) {
    for ($j = 0; $j < $cols; $j++) {
        echo $sub[$i][$j] . " ";
    }
    echo "\n";
}




/*
run:

0 1 2 3 
3 4 5 6 
6 4 3 0 

*/

 

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