public DoubleSeries GetDampedSinewave(int pad, double amplitude, double phase, double dampingFactor, int pointCount, int freq = 10)
{
var doubleSeries = new DoubleSeries();
for (int i = 0; i < pad; i++)
{
double time = 10 * i / (double)pointCount;
doubleSeries.Add(new XYPoint()
{
X = time
});
}
for (int i = pad, j = 0; i < pointCount; i++, j++)
{
var xyPoint = new XYPoint();
double time = 10 * i / (double)pointCount;
double wn = 2 * Math.PI / (pointCount / (double)freq);
xyPoint.X = time;
xyPoint.Y = amplitude * Math.Sin(j * wn + phase);
doubleSeries.Add(xyPoint);
amplitude *= (1.0 - dampingFactor);
}
return(doubleSeries);
}
public DoubleSeries GetRandomWalkSeries(int count)
{
var doubleSeries = new DoubleSeries(count);
// Generate a slightly positive biased random walk
// y[i] = y[i-1] + random,
// where random is in the range -0.5, +0.5
for (int i = 0; i < count; i++)
{
double next = _last + (_random.NextDouble() - 0.5 + _bias);
_last = next;
doubleSeries.Add(new XYPoint()
{
X = _i++, Y = next
});
}
return(doubleSeries);
}