Peak Detector for C# in Visual Studio 2008

[fbecerra]

Hi,

I have to detect the Peaks of a signal in a ScatterGraph. I have the signal created, in this case, the following signal:

double[] signal = new double[3200];
double[] x = new double[3200];
 
Random aleatorio = new Random();
 
for (int i=0; i< 3200; i++)
{
     signal[i] = 0.74 * aleatorio.Next(5);
     x[i] = i;
}
 
     
scatterPlot1.PlotXY(x,signal);
 

With this Example, I detect the Peaks with the following code:

PeakPolarity peakPolarity = PeakPolarity.Peaks;
PeakDetector pkd = new PeakDetector(0.5, 3, peakPolarity);            
pkd.Detect(this.signal, false, out this.amplitudesPeak, out this.locationsPeak, out secondDerivativesPeak);
 
scatterPlotPeaks.PlotXY(locationsPeak, amplitudesPeak);

Where this.signal is the previous signal which I have generated.

The problem is:  The Peaks which are plotting in the Graph don't coincide with the real peaks of this.signal.

¿Why??

Thanks,

[dSierra]

Hi,

Could you post the full project?

Thanks!

[igauna]

Hi,

Just use "Reset" with the same parameters before any call to "Detect".

// loop
// { 
         pkd.Reset(0.5, 3, peakPolarity); 
         pkd.Detect(this.signal, false, out this.amplitudesPeak, out this.locationsPeak, out secondDerivativesPeak);
         scatterPlotPeaks.PlotXY(locationsPeak, amplitudesPeak);
// }

Regards

Iñaki Gauna