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<?php
namespace Chippyash\Math\Matrix\Attribute;
use Chippyash\Matrix\Interfaces\AttributeInterface;
use Chippyash\Matrix\Matrix;
use Chippyash\Math\Matrix\NumericMatrix;
use Chippyash\Type\Interfaces\NumericTypeInterface;
use Chippyash\Type\Number\Complex\ComplexType;
class IsIdentity implements AttributeInterface
{
public function is(Matrix $mA)
{
if (!$mA instanceof NumericMatrix) {
return false;
}
$rows = $mA->rows();
$cols = $mA->columns();
$data = $mA->toArray();
for ($r = 0; $r < $rows; $r++) {
for ($c = 0; $c < $cols; $c++) {
$item = $this->checkItem($data[$r][$c]);
if (($r == $c) && $item != 1) {
return false;
} elseif (($r != $c) && $item != 0) {
return false;
}
}
}
return true;
}
protected function checkItem($item)
{
if ($item instanceof ComplexType) {
if ($item() == '1+0i') {
return 1;
} elseif ($item->isZero()) {
return 0;
} else {
return -1;
}
}
return $item();
}
}