Inheritance: extends GridGraph
 /**
  * construct multigraph
  */
 public function Values($values)
 {
     parent::Values($values);
     if (!$this->values->error) {
         $this->multi_graph = new MultiGraph($this->values, $this->force_assoc, $this->datetime_keys, $this->require_integer_keys);
     }
 }
 /**
  * construct multigraph
  */
 public function Values($values)
 {
     parent::Values($values);
     $this->multi_graph = new MultiGraph($this->values, $this->force_assoc);
 }
 /**
  * Checks that the data contains required fields
  */
 protected function CheckValues()
 {
     parent::CheckValues();
 }