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Hi, Try this fromula.
Dennis
Plot(EMA(C,13)>Ref(EMA(C,13),-1)AND
MACD()>Ref(MACD(),-1),"Impluse",colorGreen,styleHistogram);
Plot(EMA(C,13)<Ref(EMA(C,13),-1)AND
MACD()<Ref(MACD(),-1),"Impluse",colorRed,styleHistogram);
--- In amibroker@xxxxxxxxxxxxxxx, "polomorabe" <paul.moore@xxxx>
wrote:
>
> Hello,
>
> I'm a new user of Amibroker (since yesterday!), and as an exercise
> to learn how to user AFL, I'm trying to program Elder's Impulse
> System, as described in his book "Come Into MY trading Room".
>
> Briefly, this system generates a buy signal if:
> (Weekly 13EMA OR MACD-H are rising) AND
> (Yesterday's daily 13EMA was falling and today's is rising AND
> Yesterday's daily MACD-H was falling and today's is rising)
>
> The system generates a sell signal when any of the four boolean
> conditions is no longer true.
>
> When I run this, I get loads of arrows pasted onto the chart, so I
> as wondering if there is a debug mode available, to help me to find
> the problem?
>
> In any case, here's the code. Many thanks for your help:
>
> //
> // Elder Impulse System scan
> //
>
> // Get weekly MACD-H and EMA arrays
> TimeFrameSet( inWeekly );
> weekHist = MACD( 12, 26 ) - Signal( 12, 26, 9 );
> weekEMA = EMA( Close, 13 );
>
> // Determine if weekly MACD-H is rising or falling
> weekHistRising = IsTrue ( Ref(weekHist, -1) < Ref(weekHist, 0) );
> weekHistFalling = IsTrue ( Ref(weekHist, -1) > Ref(weekHist, 0) );
>
> // Determine if 13-week EMA is rising or falling
> weekEMARising = IsTrue ( Ref(weekEMA, -1) < Ref(weekEMA, 0) );
> weekEMAFalling = IsTrue ( Ref(weekEMA, -1) > Ref(weekEMA, 0) );
>
> // Get daily MACD-H and EMA arrays
> TimeFrameRestore();
> dayHist = MACD( 12, 26 ) - Signal( 12, 26, 9 );
> dayEMA = EMA( Close, 13 );
>
> // Determine if daily MACD-H has changed from negative to positive
> or vice versa
> dayHistUpturn = IsTrue ( ( Ref(dayHist, -2) > Ref(dayHist, -1) )
AND
> ( Ref(dayHist, -1) < Ref(dayHist, 0) ) );
> dayHistDownturn = IsTrue ( ( Ref(dayHist, -2) < Ref(dayHist, -1) )
> AND ( Ref(dayHist, -1) > Ref(dayHist, 0) ) );
>
> // Determine if 13-day EMA has changed from negative to positive or
> vice versa
> dayEMAUpturn = IsTrue ( ( Ref(dayEMA, -2) > Ref(dayEMA, -1) ) AND (
> Ref(dayEMA, -1) < Ref(dayEMA, 0) ) );
> dayEMADownturn = IsTrue ( ( Ref(dayEMA, -2) < Ref(dayEMA, -1) ) AND
> ( Ref(dayEMA, -1) > Ref(dayEMA, 0) ) );
>
> // Generate buy or sell signals
> Buy = IsTrue( ( weekHistRising OR weekEMARising ) AND (
> dayHistUpturn AND dayEMAUpturn ) );
> Sell = IsTrue( dayHistDownturn OR dayEMADownturn );
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