===================
Weekly Fractal Down
===================

A prerequisite for this indicator is Jose Silva's "Calendar Week
counter".
"Weekly Fractal Down" plots a weekly fractal down signal
on any daily chart.

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  {Weekly Fractal Down}
  {© 2004 Roy Larsen, rlarsen@man.quik.co.nz}
  {for use on daily charts with
   Jose Silva's "Calendar Week counter"}
F:=Input("End of Week,  5=Friday  6=Saturday  7=Sunday",5,7,5);
Q:=Input("Display Mode,  0=Static  1=Dynamic  2=Test",0,2,2);
  {0=Display, update on Friday when possible}
  {1=Display, update on each new bar}
  {2=Backtest, update on first bar of new week}
G:=LastValue(Highest(Sum(DayOfWeek()=F,5))=5);
I:=Fml("Calendar Week counter");
I:=Abs(I-ValueWhen(2-G,1,I)); M:=G OR I>0;
F:=G OR (DayOfWeek()=F AND I=0);
A:=LastValue(Cum(1)-1)=Cum(1);
B:=LastValue(Cum(1))=Cum(1);
J:=If(F,1,If(Alert(F,2)=0 AND M,2,0));
J:=If(A+LastValue(J)>2 OR B+(Q=1)=2,1,J);
J:=If(G,1,If(Q=2 OR Cum(J)<=1,M*2,J));
L0:=LowestSince(1,M,L);
L0:=ValueWhen(1,J,If(J=1,L0,ValueWhen(2-G,1,L0)));
L1:=ValueWhen(2,J,L0);
L2:=ValueWhen(3,J,L0);
L3:=ValueWhen(4,J,L0);
L4:=ValueWhen(5,J,L0);
L5:=ValueWhen(6,J,L0);
Single:=L2<L4 AND L2<L3 AND L2<L1;
Double:=L2<L5 AND L2<L4 AND L2=L3 AND L2<L1;
ValueWhen(1,Single OR Double,L2);

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