Normalizing output from Indicators

November 26th, 2010, 10:24 PM

Greetings! AND Happy Thanksgiving Day to those celebrating!!

Hope you had a wonderful time!!!!

I ran into set of errors in a strategy I was building, and narrowed down the issue to two small sections of code.

The sections are both in the 'short' side of the strategy, and because the indicator generating the code (Empirical Mode Decomposition) has lots of decimals in the output (using ForEx), I modified in the code to compensate, so now I have a more workable (roughly) range of +300 to -300 ... but still have the ' object reference not set to an instance of an object.' when I run the strategy. I am 99.44% sure it is not in the strategy code itself because the same components & calculations are in other lines that work without any problems, and a change as simple as changing '<' to '>'

cures the problem, but changes the strategy results

What I would like to accomplish is to 'normalize the data output from the indicator, to have all positive values, without changing the waveform that is currently being produced. I did a bit of google on this, but I cant understand the math involved

... so I am looking for a small assist from somebody more clever :sos:

the .cs of the modified indicator is attached ... it does compile as is in NT7rc1 and charts fine .. the code section that needs modification is

Code

                            
     protected override void OnBarUpdate()

        {

            if (CurrentBar == 0)

            {

                beta = Math.Cos(2 * Math.PI / Period);

                gamma = 1 / Math.Cos(4 * Math.PI * Delta / Period);

                alpha = gamma - Math.Sqrt(Math.Pow(gamma, 2) - 1);

            }

            

            if (CurrentBar < 51)

            {

                BP.Set(0);

                Peak.Set(0);

                Valley.Set(0);

                return;

            }



            BP.Set(0.5 * (1 - alpha) * ((((High[0] + Low[0]) / 2) - ((High[2] + Low[2]) / 2))*1000000) + beta * (1 + alpha) * BP[1] - alpha * BP[2]);

            

            mean = jhlEMA(BP, 2*Period)[0];

            

            Peak.Set(Peak[1]);

            Valley.Set(Valley[1]);

            

            if (BP[1] > BP[0] && BP[1] > BP[2])

                Peak.Set(BP[1]);

            if (BP[1] < BP[0] && BP[1] < BP[2])

                Valley.Set(BP[1]);

            

            avgPeak = jhlEMA(Peak, 50)[0];

            avgValley = jhlEMA(Valley, 50)[0];

            

            UpperBand.Set(avgPeak * Fraction);

            LowerBand.Set(avgValley * Fraction);

            MainPlot.Set(mean);

            MidLine.Set(((avgPeak * Fraction) + (avgValley * Fraction))/2);

        }

the BT.Set calculation is the one that needs to be tamed

Any additional input is always welcome!
TJ

November 27th, 2010, 12:01 PM

Trader.Jon

Greetings! AND Happy Thanksgiving Day to those celebrating!!

Hope you had a wonderful time!!!!

I ran into set of errors in a strategy I was building, and narrowed down the issue to two small sections of code.

The sections are both in the 'short' side of the strategy, and because the indicator generating the code (Empirical Mode Decomposition) has lots of decimals in the output (using ForEx), I modified in the code to compensate, so now I have a more workable (roughly) range of +300 to -300 ... but still have the ' object reference not set to an instance of an object.' when I run the strategy. I am 99.44% sure it is not in the strategy code itself because the same components & calculations are in other lines that work without any problems, and a change as simple as changing '<' to '>'

cures the problem, but changes the strategy results

What I would like to accomplish is to 'normalize the data output from the indicator, to have all positive values, without changing the waveform that is currently being produced. I did a bit of google on this, but I cant understand the math involved

... so I am looking for a small assist from somebody more clever :sos:

the .cs of the modified indicator is attached ... it does compile as is in NT7rc1 and charts fine .. the code section that needs modification is

Code

                            
     protected override void OnBarUpdate()
        {
            if (CurrentBar == 0)
            {
                beta = Math.Cos(2 * Math.PI / Period);
                gamma = 1 / Math.Cos(4 * Math.PI * Delta / Period);
                alpha = gamma - Math.Sqrt(Math.Pow(gamma, 2) - 1);
            }
            
            if (CurrentBar < 2)return; //<=====

           // if (CurrentBar < 51)
           // {
            //    BP.Set(0);
            //    Peak.Set(0);
             //   Valley.Set(0);
             //   return;
             //}

            BP.Set(0.5 * (1 - alpha) * ((((High[0] + Low[0]) / 2) - ((High[2] + Low[2]) / 2))*1000000) + beta * (1 + alpha) * BP[1] - alpha * BP[2]);
            
            mean = jhlEMA(BP, 2*Period)[0];
            
            Peak.Set(Peak[1]);
            Valley.Set(Valley[1]);
            
            if (BP[1] > BP[0] && BP[1] > BP[2])
                Peak.Set(BP[1]);
            if (BP[1] < BP[0] && BP[1] < BP[2])
                Valley.Set(BP[1]);
            
            if (CurrentBar < 50)return;  //<====

            avgPeak = jhlEMA(Peak, 50)[0];
            avgValley = jhlEMA(Valley, 50)[0];
            
            UpperBand.Set(avgPeak * Fraction);
            LowerBand.Set(avgValley * Fraction);
            MainPlot.Set(mean);
            MidLine.Set(((avgPeak * Fraction) + (avgValley * Fraction))/2);
        }

the BT.Set calculation is the one that needs to be tamed

Any additional input is always welcome!
TJ

I don't know about your original problem but if you make the above changes to the indicator it will be accurate from the beginning of the plots.

Dan

Normalizing output from Indicators

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Normalizing output from Indicators