test.php

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<?php
 
use Matrix\Matrix;
use Matrix\Decomposition\QR;
 
include __DIR__ . '/../vendor/autoload.php';
 
$grid = [
    [1, 2],
    [3, 4],
];
 
$targetGrid = [
    [-1],
    [-2],
];
 
$matrix = new Matrix($grid);
$target = new Matrix($targetGrid);
 
$decomposition = new QR($matrix);
 
$X = $decomposition->solve($target);
 
echo 'X', PHP_EOL;
var_export($X->toArray());
echo PHP_EOL;
 
$resolve = $matrix->multiply($X);
 
echo 'Resolve', PHP_EOL;
var_export($resolve->toArray());
echo PHP_EOL;