Money Flow Index formula

AFL Programming
#1

<MFI comes as an function in amibroker, this is the formula; in case of anyone wondering.

RMF = Avg * V; ///Avg = (High+Low+Close)/3 - so called "typical price"///RMF:Raw Money Flow///

PMF = IIf( Avg > Ref(Avg, -1), RMF, 0); ///PMF:Positive Money Flow///
NMF = IIf( Avg < Ref(Avg, -1), RMF, 0); ///nmf: Negative Money Flow///

periods = Param( "Periods", 14, 2, 200, 1 );

MFR = Sum(PMF, periods) / Sum(NMF, periods); ///MFR: Money Flow Ratio///

Plot(100 - (100 / ( 1 + MFR)),  _DEFAULT_NAME(), ParamColor("Color", colorCycle ), ParamStyle("Style") );
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#2

Thank you very much peyman. I was wondering how to code positive and negative movements over a period.