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Howard,
Thanks for that.
It still is causing a problem. Here I have taken your suggestion and
the plot works to a point. To help narrow it down refer to the code
below:-
What is wrong is if I use foreign (say XAO), even if it is the same
symbol (again XAO). It doesn't matter what symbol is used.
The foreign derived "Err" plot isn't aligned with the base symbol
although it is the same symbol!
The plot of the symbol and the expanded weekly are ok, but not the
expanded weekly of the foreign.
Where am I going wrong with this?
franc
TimeFrameSet(inWeekly);
wTik = C;
wErr = Foreign("XAO","C");
TimeFrameRestore();
Tik = TimeFrameExpand(wTik,inWeekly);
Err = TimeFrameExpand(wErr,inWeekly);
/*===========================================================
Charting
===========================================================*/
if (Status("action") == actionIndicator )
{
GraphXSpace = 10;
BackGround = colorBlack;
Plot(Close,"CLOSE",colorWhite,styleBar);
Plot(Err,"Err",colorBlue,styleDots|styleLine);
Plot(Tik,"Tik",colorSeaGreen,styleLine);
} // End actionIndicator
--- In amibroker@xxxxxxxxxxxxxxx, "Howard B" <howardbandy@xxx> wrote:
>
> Hi Ocean --
>
> Here is an afl program that begins with daily data, and plots both
daily and
> weekly data. It is easy (for me at least) to get confused and omit
one of
> the necessary TimeFrameExpand commands and not get the alignment I was
> planning.
>
> // TimeFrameWeekly.afl
> //
> // This is not a good trading system.
> // Its purpose is to illustrate the use
> // of TimeFrameSet, TimeFrameExpand, and
> // TimeFrameRestore.
> //
> // The time frame modification features of AmiBroker
> // are very powerful, but it is easy to overlook
> // a necessary conversion and get incorrect results.
> //
> SetTradeDelays(0,0,0,0);
> BuyPrice = C;
> SellPrice = C;
>
> // Start out working with daily data, as is normal
> //
> // Compute the Position In Range indicator on daily data.
> // If the term stochastic had not been coined first,
> // what is now called the stochastic oscillator might
> // be called the PositionInRange indicator.
> // PIR is an unsmoothed stochastic.
> //
> // In pseudo-code, PIR = (C-LLV)/(HHV-LLV);
> //
> // Set the lookback length for the daily indicator
> // As usual, this could be a Param or Optimize statement
> DailyLB = 20;
>
> // Compute the PIR using Daily data
> PIRDaily = (C - LLV(C,DailyLB))
> / (HHV(C,DailyLB) - LLV(C,DailyLB));
> // Plot the Daily PIR
> Plot(PIRDaily, "PIRDaily", colorRed,styleLine);
>
> // Switch to weekly data
> TimeFrameSet(inWeekly);
>
> // C is now the Weekly Close
> // As are O, H, L, V, OI
> // There are only one-fifth as many data points
> // for the weekly data, and they are stored in
> // the data arrays near the "current date" end.
> //
> // Set the lookback length for the weekly indicator
> // This can also be an Optimize statement
> WeeklyLB = 5;
>
> // Compute the PIR using Weekly data
> PIRWeekly = (C - LLV(C,WeeklyLB)) / (HHV(C, WeeklyLB) -
LLV(C,WeeklyLB));
>
> // Plot the Weekly PIR
> // If the "TimeFrameExpand" is omitted from the plot command,
> // there will be a blue line at the current end of the chart,
> // but it will not extend all the way to the left.
> Plot(TimeFrameExpand(PIRWeekly,inWeekly),
> "PIRWeekly", colorBlue, styleLine);
>
> // Switch back to daily data
> TimeFrameRestore();
>
> // Set the levels at which signals are triggered.
> WeeklyLevel = 0.10;
> DailyLevel = 0.15;
>
> // Check for signals
> // If the "TimeFrameExpand" is omitted from this line,
> // the PIRWeekly data will be concentrated at the current end
> // of the chart, and the dates will be misaligned.
> // Signals will be generated, but since they are using
> // misaligned data, they are wrong.
> Buy = (TimeFrameExpand(PIRWeekly,inWeekly) <= WeeklyLevel)
> AND (Ref(PIRDaily,-1) <= DailyLevel)
> AND (PIRDaily>Ref(PIRDaily,-1));
> Sell = BarsSince(Buy) >=3;
>
> // To see what is happening, remove one or more of
> // the "TimeFrameExpand" from the lines above,
> // and look at the data produced by the
> // Exploration that follows.
> Filter = 1;
> AddColumn(C,"C",1.4);
> AddColumn(PIRDaily,"PIRDaily",1.4);
> AddColumn(TimeFrameExpand(PIRWeekly, inWeekly),"PIRWeekly",1.4);
> //Figure 17.5 Time Frame Weekly
>
> Thanks,
> Howard
> www.quantitativetradingsystems.com
>
>
> On 9/22/07, oceanchimes <oceanchimes@xxx> wrote:
> >
> > Hi All,
> > This is causing me a real headache.
> > The plot of weekly and/or daily data doesn't align. I'm at a loss.
> > Suggestions most welcome. Here is the code.
> > I want to plot any symbol and see the weekly and/or daily plot. First,
> > I get the weekly variable, then expand to obtain the daily. Finally I
> > plot the sybol itself. The symbol and weekly plots are exactly the
> > same whether timeframe weekly or daily!!!! More confusing, the
> > expanded plot,....well no idea really as it isn't related at all. I
> > must be coding incorrectly. Comments please. New remarks/banter
> > welcome. Many thanks.
> >
> > TimeFrameSet(inWeekly);
> > wTik = Foreign("XAO", "C");
> > TimeFrameRestore();
> >
> > TimeFrameSet(inDaily);
> > Tik = TimeFrameExpand(wTik,inWeekly,expandLast);
> >
> > if (Status("action") == actionIndicator )
> > {
> > GraphXSpace = 10;
> > BackGround = colorBlack;
> > Plot(Close,"CLOSE",colorWhite,styleBar);
> > Plot(wTik,"wTik",colorBlue,styleDots|styleLine|styleThick);
> > Plot(Tik,"Tik",colorSeaGreen,styleLine);
> > } // End actionIndicator
> > TimeFramerestore();
> >
> >
> >
>
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