I figured it out myself by using SetOption("PriceBoundChecking", False);
Charles --- In amibroker@yahoogroups.com, "chuck_win" <ch...@...> wrote: > > Hi, > > For analysis purpose, I want to check rule at a specific time, and buy at > previous bar's close. However, > > buyprice = ref(close, -1); doesn't work. > > it always use current close price as buyprice. > > Thanks much for any assistance. > > Charles >