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Hello,
To limit trend line display to the last 3 months you should change
the last lines of your formula to:
emptyval = -1e10; // this is magic number that marks "empty" values
graph1=IIF( pkx <= lastvalue( pkx ) - 90, emptyval, toptrendline );
graph2=IIF( pkx <= lastvalue( pkx ) - 90, emptyval, bottrendline );
Best regards,
Tomasz Janeczko
----- Original Message -----
From: <nkishor@xxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Sunday, August 12, 2001 12:41 AM
Subject: [amibroker] Auto Channels/Triangles/Wedges
> Hello:
> I have tweaked TZ's auto trendline code to see
> Channels/Triangles/Wedges. As I scrolled thru my tickers I saw
> many lost opportunities. Well, no more!
>
> The entire code is listed below. Paste it in the Indicator
> Window, then Apply. Best viewed alone in one sheet
>
> Some tickers show very textbook like formations and breakouts:
> Examples:ABT, ADI on NYSE, AEP on NASDAQ, AEL on Toronto.
>
> If you know how to limit the lines, say for the last 3 months, then
> the charts will look even better. Thomasz might have a way to do it.
>
> The code follows.
>
> Nand
> --------------------------------------------------------
> //Channel,Triangle,Wedge Formations//
> maxgraph=5;
>
> perchg = 10; // 10 percent swings, can be changed
> //===================get bottom trendline
> btx = cum(1);
> btstartvalue = lastvalue( trough( low, perchg, 1 ) );
> btendvalue = lastvalue( trough( low, perchg, 2 ) );
> btstartbar = lastvalue( valuewhen( low ==btstartvalue, btx, 1 ) );
> btendbar = lastvalue( valuewhen( low == btendvalue, btx, 1 ) );
>
> bta = (btendvalue-btstartvalue)/(btendbar-btstartbar);
> btb =btstartvalue;
> bottrendline = bta * ( btx - btstartbar ) + btb;
> //==================get top trendline
> pkx = cum(1);
> pkstartvalue = lastvalue( peak( high, perchg, 1 ) );
> pkendvalue = lastvalue( peak( high, perchg, 2 ) );
> pkstartbar = lastvalue( valuewhen( high == pkstartvalue, pkx, 1 ) );
> pkendbar = lastvalue( valuewhen( high == pkendvalue, pkx, 1 ) );
>
> topa = (pkendvalue-pkstartvalue)/(pkendbar-pkstartbar);
> topb = pkstartvalue;
> toptrendline = topa * ( pkx - pkstartbar ) +topb;
> //===========draw lines on a price chart
> graph0 = close;
> graph0style=64;
> graph0color=2;
>
> graph1style = 5;
> graph1color = 8;
> graph1=toptrendline;
>
> graph2style=5;
> graph2color = 5;
> graph2=bottrendline;
>
> //====end for now
>
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>
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