//当参数是一个图形组合类型时，返回true。
VolData := Nday2(GfVol() , Vol() , gfColor() , ifthen ( Close() > Open() , ClRed() , ClGreen() ) );
MAVOL := Nday2('MA5', MA ( Vol() , 5 ) );
VOLGraph:=Graph(gtBar(),'VOLGraph',VolData);
MAVOLGraph:=Graph(gtLine(),'MA5Graph',MAVOL,gfColor(),clBlue());
g1:= GraphGroup(VOLGraph,MAVOLGraph,gfMinValue(),0); 
//调用函GraphGroup创建一个图形组合类型变量g1
result:= ifGraphgroup (g1);
Return result;

GData :=Nday2('MA5' , MA( close() , 5 ) );

g1:= graph( gtLine() , "MA5" , Gdata , gfColor() , clBlue() );

result:= ifGraphgroup (g1);

Return result;

//返回0