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Steve
I have no more idea of how ZigZag works than you do. The method used by
MetaStock to create it "cheats" by using future data. I would think that
creating a reasonable substitute is within the bounds of possibility, but
with compromises, and it's not something that features in my list of things
to do.
For the record I am NOT the author of the MetaStock Formula Primer or any
similar comprehensive formula guide. My offerings are much more humble. The
zip file (now removed) that you might be referring to only contained a
selection of MS 6.52 compatible 'Trade Equity' indicators and the associated
explorations.
Roy
----- Original Message -----
From: "Steve Grala" <stevegrala@xxxxxxxxxxx>
To: <Metastockusers@xxxxxxxxxxxxxxx>
Sent: Wednesday, May 21, 2003 8:03 AM
Subject: [Metastockusers] Roy Larson & zig zag formula
> He Roy,
>
> Can you give me the details of how the zig zag formula is created? Does
> your zipped MetaStock formula file explain how the zig zag indicator is
> created in MetaStock? I have been trying to recreate the indicator
myself,
> but am unable to do so. The built-in zig zag indicator in MetaStock plots
> data on the first day and the last day. I really don't see how MetaStock
> can do this. I have not been able to find anyone who knows how the zig
zag
> indicator is written in MetaStock. I created a formula that draws a
linear
> line from the first day of data to the last day of data, but I am unable
to
> have it switch back and forth at defined percent intervals. Basically, I
> created a zig without the zag.
> A:=If((C-PREV)/PREV<.1,PREV,C);
>
> slope:=(LastValue(C)-ValueWhen(1,Cum(1)=1,C))/LastValue(Cum(1));
>
> line:=ValueWhen(1,Cum(1)=1,C)+Cum(slope);
>
> line;
>
>
> Thanks,
> Steve
>
>
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>
>
>
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