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Lets forget the logic and figure out why the first barssince assignment always returns nulls. I took all the time and other conditions out and just assigned
buy = cover = maUp;
sell = short = maDn;
I assigned sinceBars for all 4 cases above and below the assignment of buy, sell, short and cover and barssince still returns nulls before and true values after. If barssince can never return good values before a logic statement how can it ever be used? I have used barssince before and never ran into this. I must be missing something very basic.
Buy = Sell = Short = Cover = 0;
// barssince returns null here
bsBuy = BarsSince(Buy);
bsSel = BarsSince(Sell);
bsSht = BarsSince(Short);
bsCov = BarsSince(Cover);
StrFormat("\nBS buy=%g, BS sell=%g \nBS short=%g, BS cover=%g", bsBuy , bsSel, bsSht, bsCov);
Buy = fMAup;
Short = fMAdn;
Sell = fMAdn;
Cover = fMAup;
// barssince returns the true values here
bsBuy = BarsSince(Buy);
bsSel = BarsSince(Sell);
bsSht = BarsSince(Short);
bsCov = BarsSince(Cover);
StrFormat("\nBS buy=%g, BS sell=%g \nBS short=%g, BS cover=%g", bsBuy , bsSel, bsSht, bsCov);
Why is the first barssince always null?
Thanks,
Barry
--- In amibroker@xxxxxxxxxxxxxxx, "Mike" <sfclimbers@xxx> wrote:
>
> I haven't tested this out. But, what value would you expect if the condition you are looking for has never happened?
>
> Zero means most recent occurence is current bar, 1 means one bar ago, 2 means two bars ago, etc. What value means "never happened yet"?
>
> Based on your observations, presumably the answer is 1e+010. You will need to handle that scenario in your logic.
>
> Mike
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Barry Scarborough" <razzbarry@> wrote:
> >
> > I must be brain dead this morning. BarsSince is not working as expected. I am trying to use BarsSince in the signal logic but when I try to set the values before the buy sell short and cover the value returned is null, 1e+010. That doesn't make sense. If I get the values after the signals are set the values are correct. But this prevents them from being use in the signal logic.
> >
> > Why doesn't BarsSince return the correct values in the first assignment?
> >
> > The code follows.
> >
> > Thanks,
> > Barry
> >
> > // BarsSince test
> > #include <AT Functions\Colors.afl>
> >
> > fMA = MA(C, 5);
> > fMAup = fMA >= Ref(fMA, -1);
> > fMAdn = fMA < Ref(fMA, -1);
> > Plot(fMA, "MA", MA1color);
> >
> > sysTime = TimeNum();
> > tradeTime = IIf(sysTime >= 73000 AND sysTime < 161500, True, False);
> >
> > Plot( C, "Close", pricecolor, styleNoTitle | styleBar ); // shows all style options
> >
> > Buy = Sell = Short = Cover = 0;
> >
> > // #### First assignment
> > // barssince returns null here
> > bsBuy = BarsSince(Buy);
> > bsSel = BarsSince(Sell);
> > bsSht = BarsSince(Short);
> > bsCov = BarsSince(Cover);
> > StrFormat("sysTime=%g, TradeTime=%g \nBS buy=%g, BS sell=%g \nBS short=%g, BS cover=%g",sysTime, tradeTime, bsBuy , bsSel, bsSht, bsCov);
> >
> > Buy = tradeTime AND fMAup; // works fine
> > // when I try to use barssince the buy logic is never true.
> > Buy = tradeTime AND fMAup AND bsBuy > bsSell; // never true
> >
> > Short = tradetime AND fMAdn;
> > Sell = tradetime AND fMAdn;
> > Cover = tradetime AND fMAup;
> >
> > // #### Second assignment
> > // barssince returns the true values here
> > bsBuy = BarsSince(Buy);
> > bsSel = BarsSince(Sell);
> > bsSht = BarsSince(Short);
> > bsCov = BarsSince(Cover);
> >
> > StrFormat("\nBS buy=%g, BS sell=%g \nBS short=%g, BS cover=%g", bsBuy , bsSel, bsSht, bsCov);
> >
> > PlotShapes(Buy * shapeUpArrow, uparrow, 0, Low, -5);
> > PlotShapes(Sell * shapeDownArrow, dnarrow,0, High, -5 );
> > PlotShapes(Short * shapeHollowDownArrow, dnarrow, 0, High, -20 );
> > PlotShapes(Cover * shapeHollowUpArrow, uparrow, 0, Low, -20);
> >
>
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