請高手幫忙寫壹個同花順中MACD指標顯示買賣紅綠箭頭的公式,謝謝!

DIFF= EMA(CLOSE,SHORT) - EMA(CLOSE,LONG);

DEA = EMA(DIFF,m);

IF(Long>short)

{

IF (CROSS(diff,dea))

BUY;

IF (CROSS(dea,diff))

SELL;

}