[amibroker] Normalized Rank Code - Problem, but almost there

["acesheet" <acesheet@xxxxxxxxx>]

Folks,

Can someone explain to me why the series '~xroc' is always zeros. 
What this script does is to assemble all the 1 year rate of changes 
of a watchlist into one variable called ROC260. The ROC data is 
shifted forward so that the most recent times record the ROC data 
(i.e. rather than near index 0 , it goes back from index BarCount-1).

I'd then like to determine the ROC's fitting into the 1%, 10%, 
20%...90%, 99% ranks based on this data. This is what the

The variable 'count' stores the actual length of data from the Group 
list being surveyed. This becomes the period for the Percentile 
function.

The variable 'y' is the rank that is being sought. It records via 
AddToComposite without a problem, even at index 0 (or the first 
point). For some reason I can't record '~xroc' or it comes up with 
zeroes via some other error.

Anyone have an idea of why I can't record ~xroc? I'm pulling my hair 
out right now over this one. I don't want to go bald.

Thanks.

-ace 

//-----------------------------------------------------------
// First seed the temporary variable for ROC(C,260) with the ROC's 
// of all the stocks in in Group0
//-----------------------------------------------------------
list = CategoryGetSymbols( categoryGroup, 0 );
ROC260=Null;
count=0;
x=Null;
y=Null;
AddToComposite(y,"~yrank","C");
AddToComposite(x,"~xroc","C");
for( i = 0; ( sym = StrExtract( list, i ) ) != ""; i++ )
{
   ROC260[i+1]=LastValue(ROC(Nz(Foreign( sym, "Close" )),260));
   count=count+1;
}
k=(BarCount-1-count);
roc260=Ref(ROC260,-k); // This is correct
AddToComposite(ROC260,"~roc260","C",1);
//-----------------------------------------------------------
// Loop i goes through percentile ranks in 
// increments of 10 from 1 to 99
// x = the ROC(C,260) that corresponds to rank y 
// y = % Rank in 10% Increments
//-----------------------------------------------------------
for( i = 0; i<=10; i++ )
{    
   y[i]=i*10;
   if(i<1) y[i]=1;
   if(i>9) y[i]=99;
   x[i]=LastValue(Percentile( ROC260, count, y[i] ));
}
AddToComposite(y,"~yrank","C",1);
AddToComposite(x,"~xroc","C",1);



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