[amibroker] cumulative volume in a week

[murthysuresh]

i am trying to get the cumulative volume so far in a week. i am having 
a hard trouble as the data does not seem to match on paper
newWeek=DayOfWeek()<Ref(DayOfWeek(),-1);
WeeklyCumulativeVol=Sum(V,BarsSince(newWeek==1));
i would appreciate some help here.