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In functions like HHV, etc. Metastock language requires a constant for the
length of the function. You need to look at the LASTVALUE() function for
using as a constant in the HHV function. Try the following code.
n:=20*(Stdev(C,20)/Mov(Stdev(C,20),5,S));
nhigh:=Ref(HHV(H,LastValue(n)),-1);
HIGH>nhigh AND CLOSE > Ref(CLOSE,-1)
Hope this works for you. There are some quirks with using LASTVALUE, but I
can't remember what they are. Maybe some one else on the list can help
identify the quirks.
Kevin Campbell
In a message dated 2/26/00 6:47:50 AM Central Standard Time,
jcob3@xxxxxxxxxxx writes:
> Help needed for formula wizards.
>
> I have coded the entry for the n-day breakout system from Perry Kaufmann's
"
> Trading Systems and Methods" as:
> ENTER LONG:
>
> n:=20;
> nhigh:=Ref(HHV(H,n),-1);
> HIGH>nhigh AND CLOSE > Ref(CLOSE,-1)
>
> I would like to be able to vary "n" using a volatility multiplier like
this
> one taken from Chande's "The New Technical Trader",
>
> Stdev(C,20)/Mov(Stdev(C,20),5,S), so that, ultimately "n" will equal 20*(
> Stdev(C,20)/Mov(Stdev(C,20),5,S)).
>
> So far so good, but when I try to implement this into the ENTER LONG
Formula
> I get the following error message.
>
> "This variable or expression must contain only constant data.", referring
to
> the "n" in the "nhigh" formula.
>
> n:=20*(Stdev(C,20)/Mov(Stdev(C,20),5,S));
> nhigh:=Ref(HHV(H,n),-1);
> HIGH>nhigh AND CLOSE > Ref(CLOSE,-1)
>
> After pondering this I thought that maybe it was because the "n" needed to
> be a whole number for this particular formula; after all, it must be
> difficult to select a highest high value for a fractional day. Therefore,
I
> altered the formula thusly:
> n:=int(20*(Stdev(C,20)/Mov(Stdev(C,20),5,S))). I was willing to accept
that
> the program would round every decimal down. Unfortunately, I received the
> same error. This makes little sense to me since I can simply put n:= opt1
> for as many days as I want and the formula works just fine.
>
> Any help with this little conundrum will be greatly appreciated.
>
> Jeff
>
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