Twiggs Money Flow for Amibroker (AFL)

_SECTION_BEGIN("Twiggs Money Flow");
/* 
Twiggs Money Flow is a derivation of Chaikin Money Flow indicator, which is in
turn derived from the Accumulation Distribution line. 
However, Twiggs Money Flow makes two basic improvements to the Chaikin Money
Flow formula:
1-To solve the problem with gaps, Twiggs Money Flow uses true range, rather
than daily Highs minus Lows.  
2-And, rather than a simple-moving-average-type formula, Twiggs Money Flow
applies exponential smoothing, using the method employed by Welles Wilder for
many of his indicators. 
 */

periods = Param( "Periods", 21, 5, 200, 1 );
TRH=Max(Ref(C,-1),H);
TRL=Min(Ref(C,-1),L);
TR=TRH-TRL; 
ADV=V*((C-TRL)-(TRH-C))/ IIf(TR==0,9999999,TR);
WV=V+(Ref(V,-1)*0);
SmV= Wilders(WV,periods);
SmA= Wilders(ADV,periods);

TMF= IIf(SmV==0,0,SmA/SmV);
Plot( TMF, _DEFAULT_NAME(), ParamColor("color", colorCycle ),
ParamStyle("Style") );
_SECTION_END();