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<?php
namespace Chippyash\Math\Matrix\Derivative;
use Chippyash\Math\Matrix\NumericMatrix;
use Chippyash\Math\Type\Calculator;
use Chippyash\Type\TypeFactory;
class Sum extends AbstractDerivative
{
public function derive(NumericMatrix $mA, $extra = null)
{
if ($mA->is('empty')) {
return TypeFactory::createInt(0);
}
if ($mA->is('singleitem')) {
return $mA->get(1,1);
}
$calc = new Calculator();
return array_reduce($mA->toArray(), function ($c1, $row) use ($calc) {
return array_reduce($row, function($carry, $item) use ($calc) {
return $calc->add($item, $carry);
},
$c1
);
},
TypeFactory::createInt(0)
);
}
}