Re: [amibroker] afl coding problem - buy signal when 2 conditions - one and then the other

[Howard B]

Hi Greenhorn --

Here is an example of an afl program that does what you ask.

//      MultipleConditions.afl
//
//      Example of afl to buy when
//      multiple conditions occur in sequence
//
//      The first condition is a setup.
//      The second condition is a trigger.
//
//      The setup must occur between exactly 1 and 9 bars
//      before the trigger, but not on the bar of the trigger.
//
Setup = StochD(14,3,3) <= 30;
Trigger = Cross(C,MA(C,5));

Buy = Trigger
                AND NOT Setup
                AND BarsSince(Setup) >=1
                AND BarsSince(Setup) <= 9;

Sell = BarsSince(Buy) >=3;

Buy = ExRem(Buy,Sell);
Sell = ExRem(Sell,Buy);

Plot(C,"C",colorBlack,styleCandle);
Plot(Setup, "Setup", colorGreen, styleLine|styleOwnScale);
Plot(Trigger, "Trigger", colorBlue, styleLine|styleOwnScale);
PlotShapes(Buy * shapeUpArrow + Sell * shapeDownArrow,
        IIf(Buy,colorGreen,colorRed));

Thanks,
Howard
www.quantitativetradingsystems.com