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<?php use Matrix\Matrix; use Matrix\Decomposition\QR; include __DIR__ . '/../vendor/autoload.php'; $grid = [ [0, 1], [-1, 0], ]; $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;