20 Day High's vs new 20 Day lows for Amibroker (AFL)

// Calculates new 20 Day High's vs new 20 Day lows.
// The new symbol "~NewHiNewLoIndex" will be found in the Workspace > Symbol >
//All > at the end.
// Input a Date 5 years back to the current Date in the Range section of the
//Analysis Window AND click the From button.
// In the Apply To section, click the Use Filter button AND click the Define >
//Include > Group > Stock ;
// to scan stocks ONLY. Right click on chart window, then > Parameters > Show
//MiddlLe Lines - NO > Levels > +-100.
// Compare against the SP-500, look for convergences, divergences. Read Elder's
//book "Trading For A Living" pp.194-200.

H1 = High > Ref(HHV(High,10),-1);
L1 = Low < Ref(LLV(Low,10),-1);
HiLoDifference = H1 - L1;

Buy = 0; 
Filter = 0;

AddToComposite( HiLoDifference , "~20HiNewLoIndex", "c", atcFlagDefaults =7);
GraphXSpace = 10;
Plot(Foreign("~20HiNewLoIndex","C",1),"20 Day New High - New Low Index",colorYellow,styleCandle);