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Harry
This is what I meant to code.
A:=Input("Enter Symbol",1,3,1);
B:=If(A=1,Mov(Security("GM",C),30,S),
If(A=2,Mov(Security("GE",C),30,S),
Mov(Security("IBM",C),30,S)));
B;
Roy
----- Original Message -----
From: "Roy Larsen" <rlarsen@xxxxxxxxxxxxxx>
To: <Metastockusers@xxxxxxxxxxxxxxx>
Sent: Sunday, July 20, 2003 7:44 AM
Subject: Re: [Metastockusers] Re: Variable Moving Average initialization
> Hi Harry
>
> I don't see the connection that you make. If() is not restricted to using
> constants so it can do pretty much anything yo want. Whether what you're
> suggesting would work or not I really don't know but I doubt that Input()
> will allow non-numeric operands. I assume you've tried it without success?
>
> The only way I can see this working is to use, say,
> A:=Input("Enter Symbol",1,3,1);
> B:=If(A,Mov(Security("GM",C),30,S),
> If(Mov(Security("GE",C),30,S),
> Mov(Security("IBM",C),30,S))); {have not tested this, sorry}
>
> Of course you would be restricted by the 2499 charracters available but
> space could be saved by calling the security in 'A' without the Mov() and
> doing the move afterwards.
>
> I guess is not much helpas I'm sure you've tried it already.
>
> Regards
>
> Roy
>
>
> > In your previous post in this thread, you included this as part of your
> example:
> >
> > VIDYA:=If(Cum(1)<=(Smooth+2),C,(SC*AbsCMO*CLOSE)+(1-(SC*AbsCMO))*PREV);
> > If(Sum(C,Smooth+2)>0,VIDYA,VIDYA);
> >
> > So this must mean that a "data array" can be a defined variable (VIDYA
is
> your example).
> >
> > Can I use the same idea in something like the Input() function for an
> Indicator? For example, could I do something like this, to input the
symbol
> of the security that I want to use in the Indicator:
> >
> > A1:=Input("Enter Symbol",GM,GE,IBM);
> > Mov(Security("A1",C),30,S)
> >
> > Harry
> >
> > --- In Metastockusers@xxxxxxxxxxxxxxx, "Roy Larsen" <rlarsen@xxxx>
wrote:
> > > Gary
> > >
> > > Seeding the appropriate bar is the key thing here.
> > > If(Cum(1)<=(Smooth+2),C,
> > >
> > > and then forcing the output to have the appropriate number of N/A bars
> is as
> > > simple as forcing it to the known N/A period any function you care to
> use.
> > > If(Sum(C,Smooth+2)>0,VIDYA,VIDYA);
> > >
> > > {VIDYA (9,20)}
> > > Length:=Input("Length",1,200,9);
> > > Smooth:=Input("Smoothing",1,200,20);
> > > AbsCMO:=(Abs(CMO(C,Length)))/100;
> > > SC:=2/(Smooth+1);
> > >
VIDYA:=If(Cum(1)<=(Smooth+2),C,(SC*AbsCMO*CLOSE)+(1-(SC*AbsCMO))*PREV);
> > > If(Sum(C,Smooth+2)>0,VIDYA,VIDYA);
> > >
> > > Some extra information. Notice how it is possible to seed an EMA on
bar
> one
> > > in the following EMA code. The fact that the plot doesn't start until
> bar
> > > two is down to the PREV function.
> > >
> > > {Exponential Moving Average}
> > > A:=Input("Periods",1,99,20);
> > > B:=P; {target data array - usually CLOSE}
> > > R:=2/(A+1);
> > > If(Cum(1)=1,B,PREV*(1-R)+B*R);
> > >
> > > Roy
> > >
> > > ----- Original Message -----
> > > From: "Gary" <garyk176@xxxx>
> > > To: <DEFANGED_Metastockusers@xxxxxxxxxxxxxxx>
> > > Sent: Thursday, July 17, 2003 7:00 PM
> > > Subject: [Metastockusers] Variable Moving Average initialization
> > >
> > >
> > > > Can anyone shed light on how I could initialize a Variable Moving
> > > > Average in the same way that Metastock's built-in VMA indicator is
> > > > initialized? This indicator is based on Chande's VIDYA, which uses
> > > > Chande's CMO as a volatility index to control the rate of change of
> > > > the variable moving average. The built-in VMA is based on a
9-period
> > > > CMO, and if the selected length of the moving average is 10, it
> > > > appears that MetaStock waits 9 bars to calculate the starting CMO
> > > > value, then begins calculating the moving average, so it's about 20
> > > > bars before the first value of the MA is plotted. And, that first
> > > > value appears to be the close of the initial bar.
> > > >
> > > > When I attempt to duplicate this in the indicator builder, using
> > > > formulas from the Guppytraders site as a starting point, my
indicator
> > > > starts at the 10th bar for a 10-period moving average, so I'm
> > > > obviously starting the calculation of both the CMO-based volatility
> > > > index and the MA itself, together on the first bar. In addition,
> > > > depending on how I use the IF() and Cum() functions to initialize
it,
> > > > the initial values of the VMA are either at or near zero, or using
> > > > the close for the first several bars, which means it takes quite a
> > > > while for the weight of those incorrect initial values to drop
enough
> > > > that my VMA stabilizes and matches the MetaStock version.
> > > >
> > > > Seems to me that it would be helpful if I had a MetaStock equivalent
> > > > of the Excel =N/A function - the indicator simply wouldn't exist to
> > > > be plotted until a specified bar, and the first calculated value
> > > > would simply be based on the close of the previous bar. Using the
IF
> > > > and CUM functions, the best I can do is have two alternative
> > > > calculations for before and after the desired bar, rather than
simply
> > > > starting the calculation at the desired bar and having NO value for
> > > > the indicator prior to that point. Any suggestions, anyone?
> > > >
> > > > Thank you.
> > > >
> > > > Gary
> > > >
> > > >
> > > >
> > > >
> > > > To unsubscribe from this group, send an email to:
> > > > Metastockusers-unsubscribe@xxxxxxxxxxx
> > > >
> > > >
> > > >
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> http://docs.yahoo.com/info/terms/
> > > >
> > > >
> > > >
> > > >
> >
> >
> >
> > To unsubscribe from this group, send an email to:
> > Metastockusers-unsubscribe@xxxxxxxxxxx
> >
> >
> >
> > Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/
> >
> >
> >
>
>
>
>
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