public function slice($offset, $length = null)
    {
        return new DataStore(
            array_slice($this->rows, $offset, $length), 
            $this->metaData
        );
    }
public function slice($offset, $length = null)
    {
        return new DataStore(
            array_slice($this->rows, $offset, $length), 
            $this->metaData
        );
    }
public function slice ( $ offset , $ length = null ) { return new DataStore ( array_slice ( $ this -> rows , $ offset , $ length ) , $ this -> metaData ) ; }
Get slice of data

@param integer $offset Starting row to get offset
@param integer $length Number of rows to take, if not specified, all row after $offset will be returned.

@return DataStore New datastore containing results.
Get slice of data