BBMACD指标

编写要求：

BM:="MACD.DIF"(12,26,9);AAM:BM,POINTDOT,COLOR00FF00,LINETHICK5;AAC:IF(BM>REF(BM,1),BM,DRAWNULL),POINTDOT,COLORBLUE,LINETHICK5;第三行怎么编写？编译错误啊求老师解决，多谢了

解答：

BM:="MACD.DIFF"(12,26,9);