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Weekly Double Smoothed Stochastic
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A prerequisite for this indicator is Jose Silva's "Calendar Week
counter".
"Weekly Double Smoothed Stochastic" plots a weekly double
smoothed Stochastic Oscillator signal on any daily chart.

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  {Weekly Double Smoothed Stochastic}
  {© 2004 Roy Larsen, rlarsen@man.quik.co.nz}
  {for use on daily charts with
   Jose Silva's "Calendar Week counter"}
N:=Input("Weekly Double Smoothed Stochastic Periods",2,99,10);
R:=Input("Smoothing Periods",1,9,3);
R:=2/(R+1);
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));
Hw:=HighestSince(1,M,H);
Hw:=ValueWhen(1,J,If(J=1,Hw,ValueWhen(2-G,1,Hw)));
Lw:=LowestSince(1,M,L);
Lw:=ValueWhen(1,J,If(J=1,Lw,ValueWhen(2-G,1,Lw)));
K:=ValueWhen(1,J,If(J=1,C,ValueWhen(2-G,1,C)));
Ls:=LowestSince(N,J,Lw);
Hs:=HighestSince(N,J,Hw);
P0:=((K-Ls)/(Hs-Ls))*100;
P1:=ValueWhen(1,J,PREV)*(1-R)+P0*R;
Lp:=LowestSince(N,J,P1);
Hp:=HighestSince(N,J,P1);
P2:=((P1-Lp)/(Hp-Lp))*100;
ValueWhen(1,J,PREV)*(1-R)+P2*R;

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