public static Signal IteratedRandomMultiplication(int iterations, int additiveConstant)
{
Signal newValues = new Signal(iterations);
double product = 1;
for (int i = 0; i < iterations; i++) {
product *= rand.NextDouble();
product += (rand.NextDouble()* additiveConstant);
newValues.Add(product);
}
return newValues;
}
public static Signal GaussianDistribution(int outputValues, int minVal, int maxVal, int elementsToSum)
{
Signal vals = new Signal(outputValues);
for (int i = 0; i < outputValues; i++) {
double sum = 0;
for (int j = 0; j < elementsToSum; j++) {
sum += rand.Next(minVal, maxVal) + rand.NextDouble();
}
vals.Add(sum);
}
return vals;
}
/// <summary>Sigma is the standard deviation</summary>
/// <param name="sigma">The standard deviation</param>
public static Signal GaussianDistribution(int iterations, double sigma = 1)
{
//Sigma is the SD
Signal sig = new Signal();
for (int i = 0; i < iterations; i++) {
double r1 = rand.NextDouble();
double r2 = rand.NextDouble();
double r = Math.Sqrt(-2 * Math.Log(r1)) * Math.Sin(2 * Math.PI* r2) * sigma;
sig.Add(r);
}
return sig;
}
public static Signal CityDevelopment(int startingCities, int iterations, double b = .1)
{
Signal cities = new Signal();
for (int i = 0; i < startingCities; i++) {
cities.Add(1);
}
for (int i = 0; i < iterations - startingCities; i++) {
if (rand.NextDouble() < b) {
cities.Add(1);
} else {
var randNum = (double)rand.Next(0, i+startingCities);
for (int j = 0; j < cities.Count(); j++) {
randNum -= cities[j];
if (randNum < 0) {
cities[j]++;
break;
}
}
}
}
return cities;
}
public Signal AutoCorrelation()
{
Signal ser = new Signal();
for (int j = 0; j < data.Count() / 2; j++) {
int numOftests = data.Count() - j;
double sum = 0;
var A = 1 / (numOftests * Variance().Sqrd());
for (int i = 0; i < numOftests; i++) {
sum += ((data[i] - Mean()) * (data[i + j] - Mean()));
}
ser.Add(A*sum);
}
return ser;
}
public Signal Transform(Func<double, double> f)
{
Signal ser = new Signal(data.Count());
for(int i=0; i < data.Count(); i++){
ser.Add(f(data[i]));
}
return ser;
}
public Signal SignalAnalysisSignal()
{
int numberOfTests = 12;
Signal newSignal = new Signal(numberOfTests -1);
for (int i = 1; i < numberOfTests; i++)
newSignal.Add(Moment(i));
return newSignal;
}
public Signal RankOrder(int amount)
{
Signal sig = new Signal();
data.Sort();
data.Reverse();
for (int i = 0; i < amount; i++) {
sig.Add(data[i]);
}
return sig;
}
public double Moment(int degree)
{
Signal signal = new Signal(data.Count());
double mean = Mean();
for (int i = 0; i < data.Count(); i++) {
signal.Add(Math.Pow(data[i] - mean, degree));
}
return signal.Mean() / (Math.Pow(StandardDeviation(), degree));
}
public static Signal IterativeFunctionApplication(List<double> seedVals, int iterations)
{
Signal newValues = new Signal(seedVals.Count() + iterations);
for (int i = 0; i < seedVals.Count(); i++) {
newValues.Add(Math.Log10(seedVals[i]));
}
for (int i = 0; i < iterations; i++) {
double first = Math.Pow(10,Math.Abs(newValues[i]));
double second = Math.Abs(newValues[i + 1]);
double third = Math.Abs(newValues[i + 2]);
switch ((int)first % 4) {
case 0:
newValues.Add(Math.Log10(second + third));
break;
case 1:
newValues.Add(Math.Log10(second * third));
break;
case 2:
newValues.Add(Math.Log10(second / (third + 1)));
break;
case 3:
newValues.Add(Math.Log10(Math.Abs(second - third)));
break;
}
}
return newValues;
}
public static Signal RandomNumber(int outputValues, int minVal, int maxVal)
{
Signal vals = new Signal(outputValues);
for (int i = 0; i < outputValues; i++) {
vals.Add(rand.Next(minVal, maxVal) + rand.NextDouble());
}
return vals;
}
/// <summary>P(x) = (mu - 1) /x^ mu</summary>
public static Signal PowerLawDistribution(int iterations, int mu = 1)
{
Signal sig = new Signal();
for (int i = 0; i < iterations; i++) {
var a = 1 / rand.NextDouble();
sig.Add(a);
}
return sig;
}
public static Signal PossionDistribution(int iterations, double lambda = 5)
{
Signal sig = new Signal();
for (int i = 0; i < iterations; i++) {
double p = Math.Exp(-lambda);
double x = 1;
int k = -1;
while (x > p) {
k++;
x *= rand.NextDouble();
}
sig.Add(k);
}
return sig;
}
//Find the probability density function
//assuming power law, and assuming exponential law
internal Signal GetSignal()
{
Signal signal = new Signal();
for (int i = 0; i < negativeBins.Count(); i++)
signal.Add(negativeBins[i]);
for (int i = 0; i < positiveBins.Count(); i++)
signal.Add(positiveBins[i]);
return signal;
}
public Signal GetSeries()
{
Signal ser = new Signal();
foreach (var keyVal in wordCount) {
ser.Add(keyVal.Value);
}
return ser;
}