public function argmin() : ColumnVector
    {
        $b = [];

        foreach ($this->a as $row) {
            $b[] = (int) array_search(min($row), $row);
        }

        return ColumnVector::quick($b);
    }
public function argmin() : ColumnVector
    {
        $b = [];

        foreach ($this->a as $row) {
            $b[] = (int) array_search(min($row), $row);
        }

        return ColumnVector::quick($b);
    }
public function argmin ( ) : ColumnVector { $ b = [ ] ; foreach ( $ this -> a as $ row ) { $ b [ ] = ( int ) array_search ( min ( $ row ) , $ row ) ; } return ColumnVector :: quick ( $ b ) ; }
Return the index of the minimum element in every row of the matrix.

@return \Rubix\Tensor\ColumnVector
Return the index of the minimum element in every row of the matrix .