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Hi Samuel
The "I" variable is actually +DI, And Rounding it should give identical values to the MetaStock function. Use the "Round(M)" for -DI.
There is a problem with my weekly ADX-related formulas when plotted on weekly charts, and that is that the first 6 -10 months is way off the scale. This is an issue with seeding (assigning a beginning value) one or more of the Wilders Smoothing variables (variables with PREV). I'll take a look at it soon.
Regards
Roy
{Weekly ADX}
{2004 Roy Larsen, rlarsen@xxxxxxxxxxxxxx}
{for use on daily charts with
Jose Silva's "Calendar Week counter"}
N:=Input("Weekly ADX Periods",1,99,10); X:=1/N;
F:=Input("End of Week, 5=Friday 6=Saturday 7=Sunday",5,7,5);
Q:=Input("Display Mode, 0=Static 1=Dynamic 2=Test",0,2,1);
{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));
Ho:=HighestSince(1,M,H);
Ho:=ValueWhen(1,J,If(J=1,Ho,ValueWhen(2-G,1,Ho)));
Lo:=LowestSince(1,M,L);
Lo:=ValueWhen(1,J,If(J=1,Lo,ValueWhen(2-G,1,Lo)));
Ci:=ValueWhen(1,J,If(J=1,C,ValueWhen(2-G,1,C)));
Ho:=ValueWhen(1,Ho>0,Ho); Hi:=ValueWhen(2,J,Ho);
Lo:=ValueWhen(1,Lo>0,Lo); Li:=ValueWhen(2,J,Lo);
Ci:=ValueWhen(1,Ci>0,Ci); Ci:=ValueWhen(2,J,Ci);
Pdm:=If(Ho>Hi AND Lo>=Li,Ho-Hi,If(Ho>Hi AND
Lo<Li AND (Ho-Hi)>(Li-Lo),Ho-Hi,0));
R:=Max(Max(Abs(Ci-Lo),Abs(Ci-Ho)),Ho-Lo);
A:=If(Cum(J>0)<N+1,Cum((J>0)*R)/N, ValueWhen(1,J,PREV)*(1-X)+R*X);
I:=If(Cum(J>0)<N+1,Cum((J>0)*Pdm)/N, ValueWhen(1,J,PREV)*(1-X)+Pdm*X);
I:=100*I/A;
Round(I);
----- Original Message -----
From: samuel leung
To: equismetastock@xxxxxxxxxxxxxxx
Sent: Sunday, January 29, 2006 6:06 PM
Subject: [Norton AntiSpam] [EquisMetaStock Group] Weekly +DI on daily chart
Hello Roy,
I'm trying to write the weekly +DI indicator (and also the weekly -DI indicator) on daily chart.
As there are codes of weekly ADX on daily chart written by you below, I think the weekly +DI indicator can be got by modifying some lines with in {{{ }}} below. However, the result is not correct. Please help to share the hint the way to fix it.
Thanks in advance.
Regards,
Samuel
==========
Weekly ADX
==========
A prerequisite for this indicator is Jose Silva's "Calendar Week
counter".
"Weekly ADX" plots a weekly ADX signal on any daily chart.
The construction is not quite true to the standard MetaStock
"Directional Movement ADX" indicator and therefore the plot values
also will differ slightly.
---8<---------------------------
{Weekly ADX}
{?2004 Roy Larsen, rlarsen@xxxxxxxxxxxxxx}
{for use on daily charts with
Jose Silva's "Calendar Week counter"}
N:=Input("Weekly ADX Periods",1,99,10); X:=1/N;
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));
Ho:=HighestSince(1,M,H);
Ho:=ValueWhen(1,J,If(J=1,Ho,ValueWhen(2-G,1,Ho)));
Lo:=LowestSince(1,M,L);
Lo:=ValueWhen(1,J,If(J=1,Lo,ValueWhen(2-G,1,Lo)));
Ci:=ValueWhen(1,J,If(J=1,C,ValueWhen(2-G,1,C)));
Ho:=ValueWhen(1,Ho>0,Ho); Hi:=ValueWhen(2,J,Ho);
Lo:=ValueWhen(1,Lo>0,Lo); Li:=ValueWhen(2,J,Lo);
Ci:=ValueWhen(1,Ci>0,Ci); Ci:=ValueWhen(2,J,Ci);
Pdm:=If(Ho>Hi AND Lo>=Li,Ho-Hi,If(Ho>Hi AND
Lo<Li AND (Ho-Hi)>(Li-Lo),Ho-Hi,0));
Mdm:=If(Lo<Li AND Ho<=Hi,Li-Lo,If(Ho>Hi AND
Lo<Li AND (Ho-Hi)<(Li-Lo),Li-Lo,0));
R:=Max(Max(Abs(Ci-Lo),Abs(Ci-Ho)),Ho-Lo);
A:=If(Cum(J>0)<N+1,Cum((J>0)*R)/N, ValueWhen(1,J,PREV)*(1-X)+R*X);
I:=If(Cum(J>0)<N+1,Cum((J>0)*Pdm)/N, ValueWhen(1,J,PREV)*(1-X)+Pdm*X);
I:=100*I/A;
M:=If(Cum(J>0)<N+1,Cum((J>0)*Mdm)/N, ValueWhen(1,J,PREV)*(1-X)+Mdm*X);
M:=100*M/A;
M:=Abs(I-M)/(I+M);
F:=ValueWhen(1,J,PREV)*(1-X)+M*X;
100*If(ValueWhen(N+1,J,F)>0,F,F);
---8<---------------------------
http://www.metastocktips.co.nz/
Modification for +DI
==============
{Weekly ADX}
{?2004 Roy Larsen, rlarsen@xxxxxxxxxxxxxx}
{for use on daily charts with
Jose Silva's "Calendar Week counter"}
N:=Input("Weekly ADX Periods",1,99,10); X:=1/N;
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));
Ho:=HighestSince(1,M,H);
Ho:=ValueWhen(1,J,If(J=1,Ho,ValueWhen(2-G,1,Ho)));
Lo:=LowestSince(1,M,L);
Lo:=ValueWhen(1,J,If(J=1,Lo,ValueWhen(2-G,1,Lo)));
Ci:=ValueWhen(1,J,If(J=1,C,ValueWhen(2-G,1,C)));
Ho:=ValueWhen(1,Ho>0,Ho); Hi:=ValueWhen(2,J,Ho);
Lo:=ValueWhen(1,Lo>0,Lo); Li:=ValueWhen(2,J,Lo);
Ci:=ValueWhen(1,Ci>0,Ci); Ci:=ValueWhen(2,J,Ci);
Pdm:=If(Ho>Hi AND Lo>=Li,Ho-Hi,If(Ho>Hi AND
Lo<Li AND (Ho-Hi)>(Li-Lo),Ho-Hi,0));
{{{Mdm:=If(Lo<Li AND Ho<=Hi,Li-Lo,If(Ho>Hi AND
Lo<Li AND (Ho-Hi)<(Li-Lo),Li-Lo,0));}}}
R:=Max(Max(Abs(Ci-Lo),Abs(Ci-Ho)),Ho-Lo);
A:=If(Cum(J>0)<N+1,Cum((J>0)*R)/N, ValueWhen(1,J,PREV)*(1-X)+R*X);
I:=If(Cum(J>0)<N+1,Cum((J>0)*Pdm)/N, ValueWhen(1,J,PREV)*(1-X)+Pdm*X);
I:=100*I/A;
{{{M:=If(Cum(J>0)<N+1,Cum((J>0)*Mdm)/N, ValueWhen(1,J,PREV)*(1-X)+Mdm*X);
M:=100*M/A;
M:=Abs(I-M)/(I+M);}}}
F:=ValueWhen(1,J,PREV)*(1-X)+I*X; {{{M is changed to I}}}
100*If(ValueWhen(N+1,J,F)>0,F,F);
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