[amibroker] Re: What is wrong with my relative strength indicator?

["liguoyi" <liguoyi@xxxxxxxxxxxxxx>]

Thanks Graham,
Barcount is better.
I modify the indicator, as below:

//offset from current date
Offset = Param("Startpoint", 20, 1, 500, 1);
price = Close;
baseprice = price[BarCount - Offset];
//plotprice = IIf(DateNum()<(Now(3)-Offset), 0, 100 * ( 
price/baseprice - 1));
Plotprice = IIf(BarIndex()<(BarCount - Offset), 0, 100*
(price/baseprice -1)); 
Plot( plotprice, Name(), colorBrightGreen, styleThick );

//Ticker can be selected
ticker = ParamStr("Ticker 1", "SPY" );
price = Foreign( ticker, "C");
baseprice = price[BarCount - Offset];
//plotprice = IIf(DateNum()<(Now(3)-Offset), 0, 100 * ( 
price/baseprice - 1));
Plotprice = IIf(BarIndex()<(BarCount - Offset), 0, 100*
(price/baseprice -1)); 
Plot( Plotprice, ticker, colorRed );

Title = "Compare to " + Offset + " days ago, "+ Name()+" ="+WriteVal
(Graph0) + " vs. " + ticker + " ="+WriteVal(Graph1) + " at " + Date();


Now it can display. I want to set the display before the offset date 
to 0. Seems barindex() doesn't work. How can I get the index of each 
bar?


Gary

--- In amibroker@xxxxxxxxxxxxxxx, "Graham" <gkavanagh@xxxx> wrote:
> I think that is a weekend
> You might be better using barcount/cum(1)/barindex() as your basis 
for this.
> You can always have a date determined from this. Or make certain 
you write
> in a check that the date has the right DayOfWeek() within 1 to 5.
> 
> Cheers,
> Graham
> http://groups.msn.com/ASXShareTrading
> http://groups.msn.com/FMSAustralia
> 
> 
> -----Original Message-----
> From: liguoyi [mailto:liguoyi@x...] 
> Sent: Saturday, 6 September 2003 12:26 PM
> To: amibroker@xxxxxxxxxxxxxxx
> Subject: [amibroker] What is wrong with my relative strength 
indicator?
> 
> 
> Below is my indicator to calculate the relative strength based on 
the 
> startpoint, say 2001/09/21
> 
> //startpint can be selected
> //startpoint = Param("Startpoint", 1010921, 1000101, 1031231, 
1); //default
> is 2001/sept/21 = 101 09 21 startpoint = 1010921; price = Close; 
baseprice =
> ValueWhen( DateNum() == startpoint, C); Plot( 100 * ( 
price/baseprice - 1),
> Name(), colorBrightGreen, 
> styleThick );
> 
> //Ticker can be selected
> ticker = ParamStr("Ticker 1", "SPY" );
> price = Foreign( ticker, "C");
> baseprice = ValueWhen( DateNum() == startpoint, price);
> Plot( 100 * ( price/baseprice -1 ), ticker, colorRed );
> 
> 
> It shows fine. But if I edit the startpoint and change it to 
1011021, 
> there is no display for the indicatior. It is strange. Can anybody 
> help me? Thanks
> 
> Gary
> 
> 
> 
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