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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@xxx> 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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