[amibroker] Help - Trying to plot linear regression lines

["ozzyapeman" <zoopfree@xxxxxxxxxxx>]

I've been trying to plot linear regression lines, with no luck. Hoping someone can point out my error.

When I am determining to enter a trade, my trading formula tests against the slope of the linear regression line over the last 4 Closes (in addition to other tests). For visual tracking purposes, I want to plot these linear regression lines.

Part of my trading formula resides in a BarCount loop, and inside this loop I successfully populate arrays, TestSignalLong and TestSignalShort. When these arrays are true, I want to plot the linear regression lines.

Here is what I tried coding but it does not properly plot the lines. I get weird results:



X2                  = Cum(1);                                        // 2nd X-coordinate in Cartesian line formula: Y = M*X + B
LinePeriod       = 4;                                             // look-back period for linear regression line
X1                  = LastValue(X2) - LinePeriod;                    // 1st X-coordinate in Cartesian line formula: Y = M*X + B
Slope             = LastValue( LinRegSlope(C, LinePeriod) );       // this is the 'M' in Cartesian line formula:  Y = M*X + B
Intercept     = LastValue( LinRegIntercept(C, LinePeriod) );   // this is the 'B' in Cartesian line formula:  Y = M*X + B
Y2                  = Slope * X2 + Intercept;                        // 2nd Y-coordinate in Cartesian line formula: Y = M*X + B
Y1                  = Slope * X1 + Intercept;                        // 1st Y-coordinate in Cartesian line formula: Y = M*X + B


// Barcount Loop
for (i = LinePeriod; i < BarCount; i++)
{
 //----------------------------------------------------------------------------------------------------------------------------------------------
// MY TRADING FORMULA GOES HERE. DURING THE FORMULA, ARRAYS ARE FILLED FOR:
// TestSignalLong[i] AND TestSignalShort[i], for use in the Indicator below
//-----------------------------------------------------------------------------------------------------------------------------------------------
}


if (Status("action") == 1 /* Indicator */)
{
  
// Plot Linear Regression Lines for each TestSignal
  if (ParamToggle("Show slope signals", "No|Yes", True))
  {
    firstVisibleBar = Status("firstVisibleBar");
    lastVisibleBar  = Status("lastVisibleBar");
    for (b = firstVisibleBar; b < BarCount AND b <= lastVisibleBar; b++)
    {
      if (TestSignalLong[b])
      {                                      
        RegLine = LineArray( X1[b], Y1[b], X2[b], Y2[b] );
        Plot(RegLine, "RegLine", colorBrown, styleThick | styleDashed);
      }
      if (TestSignalShort[b])
      {
        RegLine = LineArray( X1[b], Y1[b], X2[b], Y2[b] );
        Plot(RegLine, "RegLine", colorTurquoise, styleThick | styleDashed);
      }
    }
   }
    
 Plot(C, "Close", colorGreen, styleThick);

 }



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