[amibroker] how do you use addtocomposite?

[RazzBarry1@xxxxxxx]

First, is there a symbol in the AmiQuote data sources that will give 
the advance and decline values of the NYSE on a daily and historical 
basis? If so I would not have to search the AmiBroker database.

I am trying to scan the NYES in AB to find the number of advancing 
and declining issues. I tried to use the following but I get an 
empty composite. What am I doing wrong?

Dec = DecIssues();
AddToComposite(Dec, "~CumAD", "L");
Adv = AdvIssues();
AddToComposite(Adv, "~CumAD", "H");
delta = Adv - Dec;
AddToComposite(delta, "~CumAD", "C");
Buy = 0; // required by scan mode

After I run this I look at "~CumAD and nothing is present but the 
ticker and date. All other fields have 0. I use a filter Market = 
NYSE and all other fields blank. I also added Group = Stocks, but 
neither filled the ~CumAD fields. 

Since the AddIssues and DecIssues returns an array do I need to use 
a loop to go through the arrays and add the fields to ~CumAD? If so 
what would the loop look like? For loops need to know how many 
entries are in an array. I do not know how to determine the number 
of entries in the arrays returned. In C++ I would use GetSize but I 
do not see that in AFL. Does BarCount serve the same function? Does 
BarCount care whether you a subset of the database, set the scan to 
search only specific date ranges?

Once I build the ~cumAD say from 1970, how would I add entries 
daily, just change the date range to one day and scan?

Thanks,
Barry


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