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Bill: many thanks!!!! I first entered TJs suggestion of setbarsrequired,
and it eliminated the erratic plotting (as he explained, without it, it used
all bars in first establishing the plot but then used fewer bars for
subsequent actions). However, your code is more accurate, unless I
substitute SLPIK[1], SHPIK[1], which makes them the same, but even then it
does not match the RS value plotted in FT. Do you have some AFL code that
exactly matches the FT chart program?
Ken
________________________________
From: amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf
Of Bill Barnard
Sent: Friday, January 20, 2006 7:11 PM
To: amibroker@xxxxxxxxxxxxxxx
Subject: [amibroker] Re: Unusual Plotting Behavior
Ken,
Not sure about the cause of your unusual plotting, but try the
following substitution to get FastTack RS values:
Instead of
StartPLong=SLPIK[5];
StartPShort=SHPIK[5];
use
num1 = IIf(IsEmpty(SLPIK[BarCount - 1]), 1,
LastValue(Cum(NOT IsEmpty(SLPIK))));
num2 = IIf(IsEmpty(SHPIK[BarCount - 1]), 1,
LastValue(Cum(NOT IsEmpty(SHPIK))));
mutualMax = Min(num1, num2);
startIndex = BarCount - mutualMax;
si = startIndex;
StartPLong = SLPIK[si];
StartPShort = SHPIK[si];
--- In amibroker@xxxxxxxxxxxxxxx, "Ken Close" <closeks@xxxx> wrote:
>
> I wish to plot the Relative Strength chart from the FastTrack charting
> program; many of your are familiar with the chart.
>
> The calculation for the RS of two price series, according to the
help file
> is:
>
> RS= (Todays1stPrice/1stPricefromBeginningofSeries) /
> (Todays2ndPrice/2ndPricefromBeginningofSeries) *10
>
> So, I tried the following code. I noticed that the first 4 dates in the
> series were blank, so I elected to use the fifth day of price data
for each
> of two series. In the following, SLPIK and SHPIK are two price series
> (surrogates for the SLPIX and SHPIX Profunds mutual funds).
>
> SLPIK=Foreign("SLPIK","C");
> SHPIK=Foreign("SHPIK","C");
>
> Pr=24;
> Pr2=44;
> StartPLong=SLPIK[5];
> StartPShort=SHPIK[5];
> RS1=SLPIK/StartPLong;
> Rs2=SHPIK/StartPShort;
> RS=(RS1/Rs2)*10;
>
> ShortSma=MA(RS,Pr);
> LongSMA =MA(RS,Pr2);
> Plot(ShortSma,"",6,4);
> Plot(LongSMA,"",11,4);
> Plot(RS,"RS",colorYellow,4);
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