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Brian & Mark,
Thanks for responses. Valuewhen was the function I was somehow forgetting - too much screen time ;-)
Code below draws simple hi/lo pivot level lines on selected plot.
John <|:-) .........(dunces hat)
8<
/* draw horizontal lines at hi & lo pivot points*/
P = ParamField("Price field",-1);
Hipiv = IIf(P<Ref(P,-1) AND (Ref(P,-1)>Ref(P,-2)),1,0);
Lopiv = IIf(P>Ref(P,-1) AND (Ref(P,-1)<Ref(P,-2)),1,0);
hiline=ValueWhen(hipiv==1,Ref(P,-1),1);
loline=ValueWhen(lopiv==1,Ref(P,-1),1);
Plot (Hiline,"hiline",colorRed);
Plot (Loline,"loline",colorBlue);
8<
----- Original Message -----
From: brian.z123
To: amibroker@xxxxxxxxxxxxxxx
Sent: Friday, October 13, 2006 3:29 AM
Subject: [amibroker] Re: Can be coded without loop?
Hello John,
I came out of weekly hibernation on account of you being a gentleman
and a scholar.
Here is a small suite that fits nicely with Prakash's example.
I modified his code to make it consistent with my style (I prefer
bar charts to candlestick and generally overlay for this type of
*indicator*).
I haven't got around to doing the troughs.
They are the introductory modules for some higher level indicators
(still in the pipeline).
I hope they offer some help or stimulate some ideas that lead to
resolutions for you.
----------------------------------------------------------
//PLOTSRCHANNEL
//Plots a support and resistance channel
//Top Band looks back X periods and plots a new recent HHV each time
the Close crosses above the MA
//Bottom Band looks back X periods and plots a new recent LLV each
time Close crosses below the MA
//Suitable for overlaying on charts
/* Modified from AFL Code by Prakash Shenoi */
P= Param("Periods",10,1,30,1);//Periods
R=ValueWhen(Cross(C,MA(C,P)),HHV(H,P),1);//Resistance
S=ValueWhen(Cross(MA(C,P),C),LLV(L,P),1);//Support
Plot (R,"Res",34,8+16);
Plot (S,"Supp",32,8+16);
----------------------------------------------------------
//PLOTALLPEAKS
//PLOTS ALL PEAK RESISTANCE LINES
//Suitable for overlaying charts
//Best viewed with chart in colorBlack, styleLine view
//This example is for use with Price(C) charts
//Peaks can be defined for any array
//A Peak is defined as the Highest High central to any three bars
/*Alternative Peak definitions can use more bars
AND/OR allow for equal highs on consecutive bars*/
/*Green is chosen as the Resistance line color to
standardise ProfitStop lines for Bull trades*/
/*Red is chosen as the Support line color to
standardise StopLoss lines for Bear trades*/
PK = C > Ref(C,-1) AND Ref(C,1) < C;//Peak
PKV = ValueWhen(PK,C,1);//PeakValue
Plot(PKV, "LastPeak",34,1);
----------------------------------------------------------
//PLOTLASTPEAK
//Suitable for overlaying charts
/*Once overlayed on one chart use the keyboard arrows to scroll up
or down through symbol lists*/
//SelectedDate ignores dates (bars) before the nominated peak
//Add additional resistance lines if a deeper history is required
/*Code variations can identify major peaks or alternatively change
the timeframe upwards*/
//PLOTS THE MOST RECENT PEAK RESISTANCE LINE
PK = C > Ref(C,-1) AND Ref(C,1) < C;//Peak
PKV = ValueWhen(PK,C,1);//PeakValue
PKD = ValueWhen(PK,DateNum(),1);//PeakDate
SD = IIf(DateNum() < LastValue(PKD,lastmode = True ), Null, LastValue
(PKV,Lastmode = True));//SelectedDate (unwrap this line back to SD)
Plot(SD, "LastPeak",34,8);
//PLOT 2ND LAST PEAK RESISTANCE LINE
PKV2 = ValueWhen(PK,C,2);//PeakValue2
PKD2 = ValueWhen(PK,DateNum(),2);//PeakDate2
SD2 = IIf(DateNum() < LastValue(PKD2,lastmode = True ), Null,
LastValue(PKV2,Lastmode = True));//SelectedDate (unwrap this line
back to SD)
Plot(SD2, "LastPeak2",34,8);
----------------------------------------------------------
//PlotDynHiPeak
//DYNAMICALLY PLOTS HIGHEST PEAK VALUE FOR THE PERIOD
//Suitable for overlaying charts
/*DoubleClick left mouse button on any bar in the chart to select
the period*/
/*DoubleClick left mouse button on space to the right of the chart
to deselect the period*/
/*Caution: it will not see peaks with flat tops (two or more equal
closes)*/
/*Caution: (draft code) occasionally selects HHV resistance one bar
outside of range, cause not known*/
PK = C > Ref(C,-1) AND Ref(C,1) < C;//Peak
PKV = ValueWhen(PK,C,1);//PeakValue
P = LastValue(BarIndex(),Lastmode=True) - BeginValue(BarIndex
());//Period (unwrap this line back to P)
HPK = HHV(PKV,P);//HighestPeakValue
SD = IIf(DateNum() < BeginValue(DateNum()), Null, LastValue
(HPK,lastmode=True));//SelectedDate (unwrap this line back to SD)
Plot(SD, "PeriodHiPeak",34,8);
BrianB2 8:-).............(RayBans on forehead)
--- In amibroker@xxxxxxxxxxxxxxx, "John R" <jr-ta@xxx> wrote:
>
> Hi
>
> I wanted to plot some horizontal lines extending from successive
hi and lo
> pivot points. The code below illustrates the intention but does
not work as
> I guess IIF is evaluating the argument arrays prior to execution.
>
> Wondering if there is a way to do this without looping? Basically
need
> method to propagate same value thru array until condition changes
then
> propagate next value...
>
> John
>
> 8<
> /* draw horizontal lines at hi & lo pivot points*/
> //P = ParamField("Price field",-1);
> p=Close;
> Hipiv = IIf(P<Ref(P,-1) AND (Ref(P,-1)>Ref(P,-2)),1,0);
> Lopiv = IIf(P>Ref(P,-1) AND (Ref(P,-1)<Ref(P,-2)),1,0);
> Hline=0;
> hline=IIf(hipiv==1,Ref(p,-1),Ref(hline,-1));
> Plot (C,"close",colorBlack);
> Plot (Hline,"hline",colorRed);
> 8<
> /
>
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