directsum.php

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<?php
 
namespace Matrix;
 
use Matrix\Operators\DirectSum;
 
if (!function_exists(__NAMESPACE__ . '\\directsum')) {
    function directsum(...$matrixValues): Matrix
    {
        if (count($matrixValues) < 2) {
            throw new Exception('DirectSum operation requires at least 2 arguments');
        }
 
        $matrix = array_shift($matrixValues);
 
        if (is_array($matrix)) {
            $matrix = new Matrix($matrix);
        }
        if (!$matrix instanceof Matrix) {
            throw new Exception('DirectSum arguments must be Matrix or array');
        }
 
        $result = new DirectSum($matrix);
 
        foreach ($matrixValues as $matrix) {
            $result->execute($matrix);
        }
 
        return $result->result();
    }
}