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Gordon, Harry, Chuck,
Cross() and Ref() functions both add another N/A count to any formula in
which they are used. A 40 period EMA will force any code it is used with to
have 40 N/A bars, that is, bars that produce no output signal. Using Cross()
or Ref() will make that 41 bars, and each use of the same functions in a
formula is cumulative. Very quickly you can deny yourself access to another
week of data at the left side of the chart. Often this is no big deal, but
it is a big deal if you want to back test as accurately as possible.
The solution is to use the Alert() function wherever possible instead. Check
it out.
a:=C>=Mov(C,40,E);
a AND Alert(a=0,2);
Roy
> Thanks for the suggestion. Works fine---but I decided to implement the
Cross feature that Chuck suggested, because it is easier for me to
remember,at my age.
>
> Harry
>
> --- In equismetastock@xxxxxxxxxxxxxxx, Gordon Sutherland <gosuth@xxxx>
wrote:
> > Harry,
> >
> > You need to define that yesterday's Close was below the 40EMA to make
> > Today's status unique, as follows:
> >
> > C>=Mov(C,40,E) AND Ref(C,-1)<Mov(C,40,E)
> >
> > Enjoy Metastock Version 8.
> >
> > Regards,
> >
> > Gordon Sutherland
> >
> > -----Original Message-----
> > From: bex1210 [mailto:hmw3@x...]
> > Sent: Monday, 10 March 2003 7:22 p.m.
> > To: equismetastock@xxxxxxxxxxxxxxx
> > Subject: [EquisMetaStock Group] Expert Symbol/Alert problem
> >
> >
> > I am new to Metastock, having just purchased Version 8. I am trying to
> > replicate a setup I had in a previous program, with limited success.
> >
> > This formula signals a "buy" using the Expert: (C)>=Mov(C,40,E). The
> > reverse signals a "sell". I want to have a Buy symbol placed on the
> > chart on the first day (only) that the above Buy condition is met. And I
> > want to have a Sell symbol placed on the chart on the first day (only)
> > that the Sell condition is met.
> >
> > I tried to set this up with an Expert Symbol function, but I get a Buy
> > symbol EVERY day that the Buy condition is met; and the Sell symbol
> > every day the Sell condition is met. This makes for a very messy chart.
> >
> > So I tried to use the Alert function. But it opens an Alert window every
> > day that I open the chart; not just the first day the condition is met,
> > and it does not leave any marker on the chart.
> >
> > I am sure there is a way to achieve this. What am I missing?
> >
> > Harry
> >
> >
> >
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